connecting rods

[4cefedomni]

i'm doing a hybrid 2.5 and i'm getting ready to order my parts one thing i'm unclear of is what is the best choice of connecting rod i know most of you are going with stock t2 rods but i plan on pushing over 500hp with this motor i see on Cindy's site they sell shot peened t2 rods and aluminum race rods does anyone know anything about the aluminum ones? what the maximun hp they are good for and any real world experience with these. i'm a little hesitant on using aluminum as i have heard they can stretch under high loads.

[mock_glh]

The highest HP engines use aluminum rods. The "stretch" is normal with these and it is standard procedure to build in about .060" head to piston clearance. You could also go with billet steel rods.

[4cefedomni]

thanks for the info do you know if that clearance is built into the rods Cindy sells?

[mock_glh]

You might call her and ask. I would guess that they do.

[GLHS0658]

GRP Aluminum rods are rated @ 800 HP

[John B]

Do you have to notch a 2.5 CB to use them?

[GLHS0658]

I'll let you know...as soon as I get to it

[mock_glh]

Do you have to notch a 2.5 CB to use them?

Yes. They are pretty big on the large end. So big, in fact, that unless you narrow them down you have to bore the cylinders .040 over to get them in.

[cams1021]

Aluminum rods are strong and light but won't last in a street engine - they stretch.

I went with eagle H-beams for a SRT-4 in my hybrid as they were the best bang:buck. Every dimension is the same as a stock T2 rod except the wrist pin. It uses a bushed floating .866" wrist pin instead of a stock .826" wrist pin in a T2 rod. I just ordered my pistons with .866" wrist pins, .020" over, with the extra valve reliefs and it works fine.

[grinch-boy]

ok but is the weight the same as t2 rods

and what brand of pistonsdid you use

[turbovanman²]

Yeah, they say aluminium rods in a street engine is a big no no.

[GLHS0658]

Yeah, they say aluminium rods in a street engine is a big no no.

OLD School Aluminum rods but not the rods of today. Now they are made with a better alloy and hold up very well in street cars. Ken Crocie of H-O Racing uses them in his daily driven turbo-charged Pontiac 400 V8. In the mid 90's he had over 50,000 miles on those rods without fail. I don't know how many miles he has now. But he drove his 79 (Macho) T/A to work every day. Mecham racing produced this car back then like SLP did recently with F-bodies.

OLD school rods were made .010 short to allow for stretch at operating RPM's.
A six inch Chevy rod was 5.990

I will be happy to use an Aluminum rod. They are rated at twice the horsepower most of us will ever see. GRP and BME rods (smaller rods) are rated to 800 HP
How many of us are pushing the limits of a T2 rod with 400 HP?

Mike

[turbovanman²]

OLD School Aluminum rods but not the rods of today. Now they are made with a better alloy and hold up very well in street cars. Ken Crocie of H-O Racing uses them in his daily driven turbo-charged Pontiac 400 V8. In the mid 90's he had over 50,000 miles on those rods without fail. I don't know how many miles he has now. But he drove his 79 (Macho) T/A to work every day. Mecham racing produced this car back then like SLP did recently with F-bodies.

OLD school rods were made .010 short to allow for stretch at operating RPM's.
A six inch Chevy rod was 5.990

I will be happy to use an Aluminum rod. They are rated at twice the horsepower most of us will ever see. GRP and BME rods (smaller rods) are rated to 800 HP
How many of us are pushing the limits of a T2 rod with 400 HP?

Mike

Very interesting,

[Frank]

Or you can just go with SRT-4 Eagle H beam rods with SRT4 crank bearings! It is something like $220 for the set?! I have them in my Daytona. My pistons have the .901 pin, so i had to line bore the whole and put a new bushing in. If you have the .8xx pin, then you can just hone the bushing to accept the pin.


Frank

[grinch-boy]

were did you buy them for 220.?

[Ground Rat]

OK, so I'm using shot-peened TII rods. How much power can these rods handle? (at less then 6k rpm)

[GLHSKEN]

I know a car with over 500 ft lbs using Bone stock TII rods.. I wou,ld say... more than enough

[8valves]

I know a car with over 500 ft lbs using Bone stock TII rods.. I wou,ld say... more than enough

Just so long as you don't cross the 7K rpm threshold too often, that's a very important part of the equation.

AM

[MiniMopar]

Yeah, it's also about the rev limit than just HP.

[John H]

I run a set of cunningham rods. Maybe overkill....I don't know. Look beautiful, works of art.
http://www.cunninghamrods.com/products.html

John H

GLHS #935