| Author | Topic |
|---|
Location:
nth ringwood, Victoria
Registered:
August 2002
|
|
Re: eoi casting up new 20v throttles [pics are up ]
|
Sat, 05 November 2005 22:47
 
|
 |
|
and before any 1 says just put some other 50mm on your motor the inlet has a 12liter big air box on and is set up to bolt to the throttles plus i have the trd inlet on it as well and is the right length as well so by the time i get some 1 to make up specials to fit the motor and airbox it would be around 1800 aussie ,already have been quoted on it ,hence my decission to go this way glenn
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
Re: eoi casting up new 20v throttles [pics are up ]
|
Sun, 06 November 2005 04:00
|
|
also - beforfe anyone gets carried away with these "this pipe dia *flows* the same vol as that pipe" etc etc...
its WWAAYYY more complicated than that and comes down to peak port velocities and hamonic tuning, not equiv surface area
|
|
|
Location:
Adelaide
Registered:
May 2003
|
|
Re: eoi casting up new 20v throttles [pics are up ]
|
Sun, 06 November 2005 05:12
|
|
For comparison on a large cammed 4A, the 1600 barely flows enough air to max out a 42mm throttle, let alone the 45mm throttles which are on it at the moment. Possibly when i put the new bearings and rods in and up the rev limit it might flow that bit more, but it woudlnt be near flowing what Glenns 3S needs.
|
|
|
Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
|
|
Re: eoi casting up new 20v throttles [pics are up ]
|
Sun, 06 November 2005 05:35
|
|
| ed_ma61 wrote on Sun, 06 November 2005 15:00 |
also - beforfe anyone gets carried away with these "this pipe dia *flows* the same vol as that pipe" etc etc...
its WWAAYYY more complicated than that and comes down to peak port velocities and hamonic tuning, not equiv surface area
|
sorry i was making a vague generalisation between small 4cyl high rpm... and dinosaur single carb V8..... as a basic starting point...
it is very complex.. if it wasn't, there would be a single formula way of doing it already 
|
|
|
Location:
S.E suberbs, Vic
Registered:
December 2003
|
|
Re: eoi casting up new 20v throttles [pics are up ]
|
Sun, 06 November 2005 13:25
|
|
|
CelicaRA45: while I agree with your theory theres no way a 7a block can reliably rev to 8000 revs, let alone before you offset the crank, they just break. However I understand you were trying to illistrate a point more than anythign else. So do you have any more pics or information on your engine right now?
|
|
|
Location:
nth ringwood, Victoria
Registered:
August 2002
|
|
Re: eoi casting up new 20v throttles [pics are up ]
|
Mon, 07 November 2005 05:05
|
|
|
sam they run these engines in the NSW clubman series and the rev limit is 8000 rpm and most of them use 7a cranks etc they have no probs ,just maybe your motors that have 7a cranks break ,its that a lot of work is put into the crank ,stress relieve it offset grind rebalance it nitride it as well and maybe the same as my 3s crank take 2.5 kilos off it as well
|
|
|
Location:
S.E suberbs, Vic
Registered:
December 2003
|
|
Re: eoi casting up new 20v throttles [pics are up ]
|
Mon, 07 November 2005 13:17
|
|
|
yeah you have a point, I also didn't consider that the people who have been breaking the cranks would of most likely been using standard bottom ends, I am sure some super light forged pistons and rods would massively reduce the inertia stress loading (is that what kills cranks?)
|
|
|
Location:
nth ringwood, Victoria
Registered:
August 2002
|
|
Re: eoi casting up new 20v throttles [pics are up ]
|
Sat, 12 November 2005 23:16
|
|
|
ok update just picked up the throttle springs ,know just waiting for the machine guy to start pressing the linkages and the other guy to start making shafts and butterflies ,and the casting guy is making another 5 sets of quads then to the heat treaters and hopefully last thing will be the plastic spacer that goes near the throttle spring
|
|
|
