What is the upper hp limit on stock rods?

[UrS4boy]

Okay, I read this thread:

http://www.s2forum.com/forum/showthread.php?t=322

However, it is not clear to me what the upper crank or wheel horsepower limit is on stock AAN, ABY or ADU rods. I've been under the impression that anything more than 400 crank hp is starting into the range where you might want/need to replace the OE rods with something stronger. And certainly, by 450 whp, upgraded rods are a necessity.

Am I wrong on this?

I was trying to find the photo of the "banana" shaped OE rods to find out what had happened but I couldn't even find the photo.

[terrybullwon]

Well Its not so much power that bends rods, its torque.

I think 500Nm is the limit on stock rods.

Cheers James

[terrybullwon]

banana??

[topsparky]

Well Its not so much power that bends rods, its torque.

I think 500Nm is the limit on stock rods.

Cheers James

i thought it was 650nm james
then you have to go stronger
i might be wrong though

[terrybullwon]

i thought it was 650nm james
then you have to go stronger
i might be wrong though

I think 550Nm maybe dancing with the devil

[topsparky]

I think 550Nm maybe dancing with the devil

ummmm i will bow down to your wisdom
james

[terrybullwon]

I am sure there will be people that will say more, Its down to the owner i guess at the end of the day.

Also for 400bhp i would look into RS2 bottom end bearings and defently for 450whp

[UrS4boy]

banana?

What are those rods and pistons from? An I5 20vt (one's missing) or a 1.8 L 20vt I4?

I need to know because I want to use the photo to help settle an argument, er "discussion".

TIA

[Jamo]

http://www.s2forum.com/forum/showthread.php?t=1352

S2 rods from a 3B engine bent by an RS2 turbo

[topsparky]

I think 550Nm maybe dancing with the devil

i was closer james

[Jamo]

550nm should be your limit anything above and your playing roulette.

[terrybullwon]

i was closer james

550nm should be your limit anything above and your playing roulette.

500Nm was just being captin safe

[UrS4boy]

http://www.s2forum.com/forum/showthread.php?t=1352

S2 rods from a 3B engine bent by an RS2 turbo

It has been suggested to me that "the 3B which had an inferior ignition system which leads to preignition which = BROKEN RODS. Alot of it had to do with people using the incorrect distributor cap (yes there is a difference= narrow points)"

Is this the real problem with the 3B that doesn't occur with an ABY or ADU (or AAN)?

(I am not being argumentative, just curious).

[topsparky]

500Nm was just being captin safe

captain safe or captain SLOW

[Jamo]

It has been suggested to me that "the 3B which had an inferior ignition system which leads to preignition which = BROKEN RODS. Alot of it had to do with people using the incorrect distributor cap (yes there is a difference= narrow points)"

Is this the real problem with the 3B that doesn't occur with an ABY or ADU (or AAN)?

(I am not being argumentative, just curious).

What a load of bullsh*t IMO, yes the ignition system is inferior but if you produce to much torque / bhp than the rods can handle they will bend pure and simple.