lol push you're setup to 30psi and a 100 shot.... lets see.

honestly though... who here has ever heard of an LD9 (or even a quad) crank breaking? i know i never have....






I must confess... I feel like a monster!

Talk to me Brad about that lightened crank.


Misnblu.com
Newbie member since 1999
Thank you Dave and JBO!

z yaaaa wrote:lol push you're setup to 30psi and a 100 shot.... lets see.

honestly though... who here has ever heard of an LD9 (or even a quad) crank breaking? i know i never have....

I recall 2. One was a built turbo motor, and one was bone stock.

Still GM cranks are really good in stock for for strength.



FU Tuning

....

You can Litter it your self... just need a angle grinder...

its the Balancing itself that is important.

John.... how did they break?! Low oil? Rod Knock? I have never heard of a Crank Breaking save for bad castings...

Chris




'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08

Taetsch Z-24 wrote:....

You can Litter it your self... just need a angle grinder...

its the Balancing itself that is important.

John.... how did they break?! Low oil? Rod Knock? I have never heard of a Crank Breaking save for bad castings...

Chris

I do not remember. This was posted on the ORG many years ago. The stock one I think broke at the crank pulley (I truly think it was freak thing). The other one was manking good power and broke.



FU Tuning

Listening



- Interior FAQ -
J-Body of Michigan -

well if anybody wants there crank done up... all you gotta do is send it to me.

pm me if you're interested.



I must confess... I feel like a monster!

and what kind of price are we talking here?

Is it possible to take off less? Like 5-6 lbs?



FU Tuning

i was told not to tell prices over the open forum. so if you'd like to know more... pm me.

john - dont see why not but ill find out for sure.




I must confess... I feel like a monster!

just remember it all depends of your application.

Generally OE cranks are heavily under-counterweighted, if you lighten them you can forget hi rpm applications

I had talked to my machinist about lightening and modifying the crank like you have pictured. He told me through his experience it doesnt matter what make the crank is, taking off that much will drastically reduce the life of the crank. I trust his judgment, when hes not working on engines hes racing, so hes tried a LOT of combos. He said a crank modfied like that will only last a few races before it gives out or wears out the bearings. That being said he said there is a sweetspot where you gain power but still retain the longevity you just need to play with it. Just thought Id throw that info out there.

So basically remove some portion of weight yet do not remove excessively.

GMR has got nothing on this

Zs Z wrote:I had talked to my machinist about lightening and modifying the crank like you have pictured. He told me through his experience it doesnt matter what make the crank is, taking off that much will drastically reduce the life of the crank. I trust his judgment, when hes not working on engines hes racing, so hes tried a LOT of combos. He said a crank modfied like that will only last a few races before it gives out or wears out the bearings. That being said he said there is a sweetspot where you gain power but still retain the longevity you just need to play with it. Just thought Id throw that info out there.

no offense but i doubt the guy you're referring to as ever raced a 2.4 or quad powered car before, if he as... fine. but i doubt it. so i take what he says with a grain of salt. sorry.

this guy actually has built LD9 ad quad motors for cars that actually have raced. they last just fine for them. and stock cars are beat on pretty badly, i would not have any regrets putting this crank in my car for street driving. if it lasts, great... if not then i guess i found out what not to do. LOL

i am going to find out if its really worth it or not though.



I must confess... I feel like a monster!

I would like to know what series they are or were racing quads in oval racing. Most series I have heard of do not allow 2.4's, or OHC motors in.



FU Tuning

z yaaaa wrote:

Zs Z wrote:I had talked to my machinist about lightening and modifying the crank like you have pictured. He told me through his experience it doesnt matter what make the crank is, taking off that much will drastically reduce the life of the crank. I trust his judgment, when hes not working on engines hes racing, so hes tried a LOT of combos. He said a crank modfied like that will only last a few races before it gives out or wears out the bearings. That being said he said there is a sweetspot where you gain power but still retain the longevity you just need to play with it. Just thought Id throw that info out there.

no offense but i doubt the guy you're referring to as ever raced a 2.4 or quad powered car before, if he as... fine. but i doubt it. so i take what he says with a grain of salt. sorry.

No offence taken. He hasnt worked with many quads before but he has worked with a wide variety of engines. Anyways just food for thought. Hope for all our performance sakes it works out for you.

John Higgins wrote:I would like to know what series they are or were racing quads in oval racing. Most series I have heard of do not allow 2.4's, or OHC motors in.

here in iowa you can run any n/a 4 cylinder under 2.5 liters well at our 3 local tracks atleast



Edited 1 time(s). Last edited Sunday, October 11, 2009 7:47 PM

a 2.5 L 4 banger ?

that would be sweet

just throwing my 2 cents your way

-Ben



Overall Best times

60' - 1.857 (6/24/07)-(Drag Radials 205-50-15)
330' - 5.552 (6/24/07)-(Drag Radials 205-50-15)
1/8 - 8.644 (7/25/08)-(Hoosier Drag Radials 225-50-15)
M.P.H. - 82.05 (4/20/08)-(Hoosier Drag Radials 225-50-15)
1000' - 11.229 (7/25/08)-(Hoosier Drag Radials 225-50-15)
1/4 - 13.410 (7/25-08)-(Hoosier Drag Radials 225-50-15)
M.P.H. - 104.95 (4/20/08)-(Hoosier Drag Radials 225-50-15)

** ALL MOTOR **
* 193whp @ 7600 rpm *
* 149 tq @ 5100 rpm *

Website: www.benwenzeljr.com

2005 GM Small Car Bash - Lost 2nd rd - H2 Class
2007 GM Tuner Bash - Runner Up - Broken Pressure Plate
2008 GM Tuner Bash - Winner - by default
2009 GM Tuner Bash - #6 in the Q8 (2008 ponitac solstice)

like the nissan 2.5L ?? that not allowed ?

how about a 87 gmc jimmy? mine had a 2.5 4 banger.


- Your not-so-local, untrained, uncertified, backyard mechanic. But my @!#$ runs

...Great Engine that old 4Tec 2.5........ Put the Cothworth valve train on......ya.
Then you have the prototype Quad-4.

Chris


'02 Z-24 Supercharged
13.7 @102.45 MPH Third Place, 2007 GMSC Bash SOLD AS OF 01MAR08

I have a 2.4 crank for sale if you want to send Brad a core




Jason
99 Z24 Supercharged
157hp/171tq - NA
190hp/170tq @ 6psi

LG0/LD9 for Life

so the other day on the way to pick up wades car in wisconsin we stopped at the guy's machine shop...

got a look at the gutted crank first hand. my jaw dropped.the work on this this is absolutely stunning. you can definitely feel the weight difference as well. like night and day. i dropped my crank off to get worked on, although i wont be able to afford to have it done just yet. he was cool with me just leaving it there for awhile til i gathered funds. i also need to get him a 2.3 crank gear yet.

the guy is cool as hell, an old guy that really knows his stuff. believe me, some of the things he's been doing over the years makes the stuff we've been doing look like child's play. be on the look out for a post in here with some more goodies....

here's the pics i got. the stock crank on the right is mine:













and here's some of one he had only one side finished on. was still in the lathe....













I must confess... I feel like a monster!

sweet! now if I only had the urge to build another 4 cylinder!




SPD RCR Z - '02 Z24 420whp
SLO GOAT - '04 GTO 305whp
W41 BOI - '78 Buick Opel Isuzu W41 Swap

I'm impressed Brad.
Next thing you know, I'll be shipping you a crank.


Misnblu.com
Newbie member since 1999
Thank you Dave and JBO!