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Location:
Ballarat
Registered:
September 2003
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port & polish
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Wed, 18 February 2004 06:49
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look, no one seems to be able to give me any information on this either, but if anyone can help itd be great. ok, im trying to get me 2tg as quick as possible without spending mega bucks, so a port n polish got considered, then unconsidered when i found out it was 500 bucks.
today, the guy i am working on my car with told me that we could have done it ourselves, it just wouldve taken a long time  this gave me a mechanical burden because it is a modification i could have done but i didnt do .
so what i want to know is, how useful is a port and polish done in the garage? is it recommended? what process do you use? also, am i able to still do it now? all the valves etc are in.....but the head isnt bolted on....am i able to do a mild job to ease my burden? can i do anything in the port and polish department?
also, here is the big question, how much power will it give me in a 2tg around about. how many kw will a professional job give me round about, and how much would this equate to round about in a qt mile in ta22?
is a home job just shit, and wont give stuff all kw increase?
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Location:
Brisbane
Registered:
October 2002
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Re: port & polish
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Wed, 18 February 2004 06:58
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$500 is not a bad price, my work mate paid $1440 for a port and FLOW on his G200 gemini SOHC head
the polishing bit is crap, they used to beleive that having is PERFECTLY smooth was best, but they worked out that it didnt do shit.
the problem getting it done at home is if u make them flow differently it may decrese performance,
go for some cams
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Location:
Ballarat
Registered:
September 2003
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Re: port & polish
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Wed, 18 February 2004 07:02
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yeah i spent about 800 bucks getting all my head set up for cams and stuff....i just want to know how much power increase a port and polish gives, prolly best if a home job wasnt done...
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Location:
Brisbane
Registered:
May 2002
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Re: port & polish
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Wed, 18 February 2004 07:05
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You'll find your 2T-G already has ginormous ports, so there's nothing to be gained from porting unless you're building a full-house mega-dollar race engine. It would be beneficial to get in there with a die grinder and clean up any casting dags and just generally smooth it out a bit, but I wouldn't go any further than that. $500 is a lot of money to pay for something that will do very little or nothing on a street engine...
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: port & polish
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Wed, 18 February 2004 07:06
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home job can be great if you do it well. problem is it's hard to quantify without a flow bench.
many professional porters are not good, but think they are 
after seeing a 2TG head, i don't think you have much that can be done to increase flow... pretty much all you want to do is clean up machining marks etc..
sandcast/rough finish is preferable..
some heads respond well to porting, ie if they are shit to start with (like K motors ) but 2TG ports are good from factory.
Cya, Stewart
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Registered:
August 2002
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Location:
melbourne
Registered:
November 2003
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Re: port & polish
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Wed, 18 February 2004 07:13
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i got my 2TG head ported and polished last year, but i have no idea on the advantages over stock.
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Location:
Ballarat
Registered:
September 2003
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Re: port & polish
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Wed, 18 February 2004 07:16
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awesome, well that is real good to know. burden relieved. so with the dye grinder and stuff, or the rough finish, can i do that now that all my valves and that are in? or is it not worth the risk of letting bits of allow fly into my head? can u stuff up the flow by just doing that little bit of work? how much time is involved?
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Registered:
August 2002
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Re: port & polish
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Wed, 18 February 2004 07:18
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You will have to remove the valves
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Location:
Ballarat
Registered:
September 2003
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Re: port & polish
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Wed, 18 February 2004 07:20
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ah dont think i will worry bout that now.....so, there is nothing i can do without having to pull apart my head?
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Location:
Ballarat
Registered:
September 2003
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Re: port & polish
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Wed, 18 February 2004 07:35
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i guess i shouldve asked for a mild port and polish while i was having the head reconditioned, hmm, how much difference does just cleaning up the residue shit make? would i notice it?are we talking tenths of a second here?
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Location:
Brisbane
Registered:
May 2002
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Re: port & polish
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Wed, 18 February 2004 07:49
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It depends how worked the engine is going to be. For a stock or near-stock 2T-G, you won't notice it.
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: port & polish
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Wed, 18 February 2004 07:59
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2tg heads on flow bench 220 std flow with 420 thou lift 200 hp
2tg 222 head flow bench same lift 204 hp
260 head same flow bench 206 hp these are all std heads with this cam lift after a clean up and opened up the exhaust ports the 1st made with same lift again 210 2nd 214 and last 216 hp so not 2 much in gains group C you wernt allowed to touch the haed at all only use the TRD valves that were 45mm from memory and bigger exhaust as well
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Location:
Ballarat
Registered:
September 2003
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Re: port & polish
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Thu, 19 February 2004 07:59
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um, ra45, i dont really get that sorry dude....
i will have cams bout 285 degrees i think, lightened flywheel, headers, 2t/3t conversion, bigger exhaust and cold air intake.
with all that would i notice a port n polish? or is it more for REAL worked cars
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: port & polish
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Thu, 19 February 2004 09:09
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the figures i gave you are flow figures for the 2tg heads in std form and after they were ported have a nother look
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Location:
Ballarat
Registered:
September 2003
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Re: port & polish
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Thu, 19 February 2004 09:16
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so, the gains arent that great? round about how fast do you think my 2t/3t will run a qt mile in ra45? whats your real name btw sorry dude? are there any modifications i have missed-apart from forced induction or changing internals...
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: port & polish
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Thu, 19 February 2004 09:22
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your ta22 will weigh 1000 kilos my te27 levin was 860 kilos and was agrp a motor 10.5 to 1 pistons 44 mikunis trd rally cams ,holinger close ratio box ,trd exhaust and alot of trd parts in the motor made 124 hp at back wheels when i had it
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Location:
sydney
Registered:
April 2003
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Re: port & polish
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Thu, 19 February 2004 09:40
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what is the talk that the exhaust ports and runners are shiny smooth to prevent carbon buildup, and the intake rogh to help atomise fuel, is this B.S, or is this the way to do it?
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: port & polish
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Thu, 19 February 2004 10:13
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the grp c haeds were stock only with bigger valves and made 165bhp at the f/wheel
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Location:
Seattle area, USA
Registered:
June 2002
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Re: port & polish
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Fri, 05 March 2004 13:19
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the more worked it is the better the result of the porting will be. stock engine; not much to be had. built engine; high comp. pistons, O/S valves, big cams, at least 44mm sides, or ITB's etc. you will see and feel a bigger gain. its money well spent if all out power is your quest. Even more so if your boosting. The port velocity isn't as important as flow if it's being force feed. my friends 2TG that is getting boost very soon. we did the ports up about 10mm bigger. slight reshape of the exhaust to raise the roof and it's getting 18RG valves with the seats opened 3mm. It's a high flowing SOB.
If this was a N/A engine i wouldn't have gone nearly as big and just concentrated on smoothing all the casting flash, short side radius, valve bowl areas, deshrouding the valves etc..
An engine is just an big air pump really, the more air you can get into an out of it the more power it will make.
[Updated on: Fri, 05 March 2004 21:58]
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: port & polish
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Fri, 05 March 2004 17:20
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| crazy_camry wrote on Thu, 19 February 2004 20:40 |
what is the talk that the exhaust ports and runners are shiny smooth to prevent carbon buildup, and the intake rogh to help atomise fuel, is this B.S, or is this the way to do it?
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intake side.
roughness (smooth sandcast finish) promotes a stationary boundary layer of air,, this decreases the effective port side, but kinda reduces friction, since the stationary air has less friction on air than the port walls (like on thorpies swim suit, or americas cup yachts)..... and this boundary layer helps stop fuel dropping out...
exhaust, shiny=less build up and less friction? doesn't seem to matre that much, but it makes wallets lighter
Cya, Stewart
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Location:
Seattle area, USA
Registered:
June 2002
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Re: port & polish
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Fri, 05 March 2004 21:56
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Stewart, send me your head. I'll make a believer outa ya!
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Location:
NSW, East Coast
Registered:
July 2003
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Location:
Canberra
Registered:
May 2002
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Re: port & polish
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Sat, 06 March 2004 00:39
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Realistically, it's not worth the investment in tools if you're only going to do one head. Even if you've already got a die-grinder and compressor, you still need a good quality burr for the grinder (around $100) and a porting kit (cartridge rolls, flap wheels etc, around $250 I think), plus a lot of your time...
Makes $500 look pretty good to me..
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Location:
Seattle area, USA
Registered:
June 2002
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Re: port & polish
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Sat, 06 March 2004 02:44
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true.
if its only for one head it could be worth it if you don't want to spend the $500+(which is a desent price if done by a "Pro" and flow bench tested, imho) If you did other things as well as heads, intakes, exhaust manifolds, turbo housings, turbo elbows, plenums, the list goes on.. I may have spent $250 on the "tools" i use. But they have also more then paid for themselves many times over.
Heres a few things i've done over the last 2 yrs or so. http://photos.yahoo.com/BoostedToy
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