2.7T - block limits

[vtraudt]

Found some opinions on 1.8T block limits (330 lb*ft or 82.5/rod).
1.8T using 20mm (AEB, -1999) and 19mm (ATW, 2000+).

What is the consensus for the 2.7T block limit? 500 lb*ft?

[keeganhartman]

big discussion about this in b5 s4/rs4 forum. I think they are saying 600-650. There are some guys over there doing interesting things.

[chaos2984]

should be able to hold more than that. It has 4 bolt mains and the center 2 main caps are also jack bolted threw the block for more strength. I woul think easily over 600 ft lbs

[Lunchboxhero]

600 Hp is about what you'll be able to see, I wouldn't push a 2.7 over 600 Tq though... Notorious for cracking with even a small spike in the torque curve.

[2380S4]

600 Hp is about what you'll be able to see, I wouldn't push a 2.7 over 600 Tq though... Notorious for cracking with even a small spike in the torque curve.

Agreed, but it's usually the rods that snap first before the block, most guys planning on over 600 HP's at wheels or 500TQ will replace the rods with after market stronger ones.

[diabolical1]

as i understood it so far, the rods will take a bow at the 500s level, but people start worrying about the integrity of the block itself at the 600s level - where it basically starts cracking or tearing itself apart at the mains. i also have seen a few members illustrating the differences in casting between the different 2.7s out there (APB, BEL, etc.) and speculating on increased overall capability.

[vtraudt]

as i understood it so far, the rods will take a bow at the 500s level, but people start worrying about the integrity of the block itself at the 600s level - where it basically starts cracking or tearing itself apart at the mains. i also have seen a few members illustrating the differences in casting between the different 2.7s out there (APB, BEL, etc.) and speculating on increased overall capability.

rods: 500 what cHP, awHP cTQ awTQ
block: 600 ditto?

Probably a good idea to put girdles on the block when putting rods and bearings in.

[vtraudt]

Agreed, but it's usually the rods that snap first before the block, most guys planning on over 600 HP's at wheels or 500TQ will replace the rods with after market stronger ones.

600 awHP = 800 cHP
500 awTQ= 660 cTQ

Use those as sane thresholds for stock 2.7T block?

[diabolical1]

rods: 500 what cHP, awHP cTQ awTQ
block: 600 ditto?

Probably a good idea to put girdles on the block when putting rods and bearings in.

far as i can tell they were talking at the wheels in both cases. keep in mind as well that this is me just writing a synopsis of all i've read on the subject on this forum. i have no personal experiences to cite.

as for girdles ... on paper it does seem like a no-brainer. however, i've come across mixed reviews from the people that actually went that route. many express regrets in varying measure, some say they've had no issues and still others decide to design and build their own (so far, i haven't seen one running yet, but i also don't go out of my way to follow up on them either).

off the top of my head, the user britishturbo (i think) has a fairly current thread going where you can get more solid and informed information on these subjects. there are others i've seen over the years, for example, i remember Guruman talking about girdles in a thread, but i can't remember if he started it or was just posting in someone else's.

[vtraudt]

Well, my anticipated (before building block up with rods) power goal of 600 cHP should be fine for the rods, and certainly not running into 'girdles needed' territory. When the next step comes in (time) view, I will do my due diligence on block (and head) fortification.