| Author | Topic |
|---|
Location:
Lost in the K hole
Registered:
May 2002
|
 rod length info needed
|
Sun, 11 April 2004 04:09
|
 |
does anyone have the following they could possibly measure the eye-eye rod lengths for me:
-MTE
-5M
-6M or 7M
as the stroke changed across these models, either the deck height, rod length or piston compression height had to change. my money is on the rods being different.
if someone can confirm that the 7m rods are infact 3mm shorter than the 5m rods, i might just wet my pants 
also, does anyone have any info on nissan rods?
cheers
ed
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
Re: rod length info needed
|
Sun, 11 April 2004 08:52
|
|
|
*cough*
|
|
|
Club Member
Location:
sydney
Registered:
May 2002
|
|
Re: rod length info needed
|
Sun, 11 April 2004 20:24
|
|
Hmm making a short stroker ed ?  trying to get a little more RPM huh 
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
Re: rod length info needed
|
Mon, 12 April 2004 00:14
|
|
close...
same stroke, but found a piston with a 3mm shorter compression height. if the 5m rods are 3mm longer (as i suspect), i can plonk this all together, and gain a much more favourable rod/stroke ratio.
plus, this piston will give me about 12:1 c/r
it also means ill need to rebush the small ends down to 20mm (from 22)... ive not found a standard bush that will do this, so im hoping wilkins will be able to do it from scratch. i have to talk to him...
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
|
Location:
1st street on the right
Registered:
November 2002
|
|
Re: rod length info needed
|
Mon, 17 May 2004 07:41
|
|
Hey boxhead, i've ghot the 5m undeer the house remember. come over next sunday and you can check it out and remove my stitches at the same time doc.
j
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
Re: rod length info needed
|
Mon, 17 May 2004 08:02
|
|
things are getting a little more serious than 5m rods now justin 
some of those eagle H beam forgies are looking pretty attractive
|
|
|
Location:
South Australia
Registered:
July 2002
|
|
Re: rod length info needed
|
Mon, 17 May 2004 08:15
|
|
Try Ridgecrest in Vic - they make forged H-beam conrods...I think they are slightly hefty though, and don't come in cheap.
That rod-tech article says that the lower rod/stroke ratio pistons should have a longer skirt? Yet the 5S-FE conrods are the same length as the 3S-conrods (1.6 rod/stroke for 3S, 1.45 for 5S) but the 5S-FE has a mini-skirt on compared to the 3S-GE pistons.
Does this partly explain the difference in redline between 5S-FE and 3S-GE (6300 for 5S, 7300 for 3S).
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
Re: rod length info needed
|
Mon, 17 May 2004 08:24
|
|
the longer skirt is usually related to the side loads required to be borne by the skirt due to the approach and departure angles of the rod.
perhaps the 3s has longer skirts to withstand the loads it will suffer as a consequence of its high rpm nature?
either way, i doubt it is the skirts that dictate those redline figures. more likely it is the design of valve train componentry of the 3s: the 5s's gear may not be designed to cope with high rpm use. the intake, valves and ports of the 5s may not support high rpm use either. maybe the rods and crank are of different construction?
plenty of other things to restrict rpm in that situation me thinks
|
|
|
Location:
South Australia
Registered:
July 2002
|
|
Re: rod length info needed
|
Mon, 17 May 2004 08:55
|
|
Hrm...hijack...
The FE head has a gear running the exhaust cam, whereas the exhaust and intake cam are both driven by belt in the GE head. The cam on the FE looks rather tame too.
Still - the approach angle of the 5S would be greater than that of the 3S so it should have the longer skirt?
The crank and rods are slightly different on the 5S, the only obvious physical difference is the larger big-end diameter for the 5S, and the longer stroke for the 5S crank. The gudgeon pins are the same size, rod length is the same. I've asked this elsewhere, but how do you test a crank's strength? I'm guessing a crank won't survive any procedure designed to test it's strength...but there's alot to it - torsional strength, maximum force on the big end journal etc etc?
Maybe I'll start a new thread
|
|
|
I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
|
|
|
Location:
Lost in the K hole
Registered:
May 2002
|
|
Re: rod length info needed
|
Tue, 18 May 2004 21:56
|
|
| gianttomato wrote on Wed, 19 May 2004 03:31 |
*cough* Eagle rods are shit. *cough*
|
ahh nutz.. 
why is nothing cheap, good?
|
|
|
Location:
South Australia
Registered:
July 2002
|
|
Re: rod length info needed
|
Tue, 18 May 2004 23:53
|
|
(pimp)
Ridgecrest
(/pimp)
Probably set you back $2000-$2500 though for six conrods, but when it comes to either
a) Spending $2500 now or
b) Saving $1400 bucks now only to spend $5000 replacing the engine later.
I know which one I'd choose. It does depend how serious you want your engine to be though, and whether or not the conrod is the component under the most significant stress too.
|
|
|
I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
|
|
Re: rod length info needed
|
Wed, 19 May 2004 05:03
|
|
|
Argo (in Newcastle) are also an excellent bit of kit. $1900 + GST for 6 though . (4K + for Ti).
|
|
|
