Schurters LT1

iTrader: (2)

Hey guys/the big shops that are out there, i am sure you see cogs on race cars often...what do you think about cogs on the street in a daily drive, 5000km a year...

Car would be and auto 4l80e 3200-3500 stall, YSI,

thanks

Twin76mmTA

iTrader: (1)

I'be leery of running a cog on a conventional lt1, you already have a stressed crank with the opti hanging out the front of the motor.

There have been cases where the snout has been broken off of lt1 cranks running high boost, i don't remember if they where cog or not.

slowredz

iTrader: (23)

I am going to try a cog, but I have an LS1

BlackScreaminMachine

iTrader: (17)

If you pin the crank and have a good forged unit in place, there will be no issues.

Schurters LT1

iTrader: (2)

guys have run cogs in race car set up's (LT1) and the crank has lived a happy life..but what about on the street....

stevieturbo

Why not just go for a 10 or 12 rib ?

No slip, and no cogs to worry about....

That said, the Aussie's routinely use cogs on their LS1/YSi combos, and appear to have it work for them.

BlackScreaminMachine

iTrader: (17)

Worst Ive seen for a LT1 was the crank snout got ground down due to not pinning the crank.

No Juice

iTrader: (11)

Do you have any links to some of these? I'd like to see how they have them set up, I bet its pretty cool looking

stevieturbo

Aussies place the blower upper left side of motor...basically a GTO layout.

and same as my own, albeit Im using a custom 12 rib.


very old pic when I was starting...although I switched from cog to ribbed before it ran.

http://gallery112848.fotopic.net/p10596488.html

DeltaT

iTrader: (5)

First time I've seen your pix and site, Stevie - love the 4DR project and your numbers. I'll be real happy to get the boost up and start getting anywhere near your numbers. Awesome car and truly low-key.

And your numbers, Schurters LT1, are very impressive as well. I have a 383 smallblock Chevy and am just getting started tuning with the new T-trim (upgraded from an S-trim). I'd be extremely happy getting within 10-15% of your numbers. Fighting with belt slip and perhaps bracketry right now.

Thumbs up to both of you.

If you do try the cog, I'd be real interested in your results and and change in sound.

Jim

LittleRedZ

iTrader: (5)

so far so good here, i havent really put any miles on the street but the car has had about 10 hours of total running time, i took it out in the parking lot and hit it a few times with charge pipe disconected belt is staying on and showing no signs of coming off or wear yet.

Rickys S/C Z28

iTrader: (13)

any one got pics of a coged set up on a camaro/TA (LS1?)

Schurters LT1

iTrader: (2)

no one out there has any info, or has run cogs on there car ???

1bdbrd

iTrader: (12)

The opti is driven by the cam, not the crank. The only connection the opti has to the crank is via the timing chain.

Schurters LT1

iTrader: (2)

Z8's had cogs but i think he was all race car, same with LJ i do think he did put some driving on his car ??

LittleRedZ

iTrader: (5)

lj drove his car reguraly but he also snaped his crank behind the timing gear adn destroyed his engine, he put it back toghether and now selling the car.

1dirtyZ

iTrader: (1)

stevieturbo, where did you get that crank cog?? will it fit an ati damper?

i second the "low key " comment

stevieturbo

The crank cog is from CAPA in Australia. I believe it is just a typical Vortech piece though.
It was an 86T item for a 50mm belt.

At that time, given what I wanted to do, it wasnt suitable with regards to pulleys and available belt sizes ( or lack of belt sizes ). And CAPA were no help whatsoever in this regard.
Problem was I wanted to use the YSi on a stock engine at first. So this did impose limitations.

So I sent the crank pulley to ASP, and they re-cut it for a 12 rib instead, ended up at 8.25"

It mounts to a Powerbond pulley using an adaptor.. Its a direct replacement for stock,, albeit with 6 x 3/8" UNF holes for mounting. I would guess these use the same PCD as an ATI damper.
http://gallery112848.fotopic.net/p8886908.html
http://gallery112848.fotopic.net/p8886909.html

I wanted a little more, so I then got ASP to make me a 8.5" crank, which I am currently using.
ASP also made me blower pulleys...currently down to 3.0"

For all the cog stuff, CAPA in Australia will have pretty much everything you need, as the Aussie guys regularly use cogs...although not in an F-Body fitment obviously.
http://www.capa.com.au/vortech_performance_pulleys.htm

1dirtyZ

iTrader: (1)

thank you soooo much stevie!!!

No Juice

iTrader: (11)

I beilve ATI makes a cog kit for the LS1. Check their site