Low Compression LT5 going together! [Archive]

RHanselman

04-14-2008, 12:40 AM

The short block was complete last week with the rest to follow this week.

Pistons are 9:1 custom units
New cylinder bore is 4.030"
CI is 374
Stock rods (reworked)
Stock valve train and rods (light weight lifters added)
Heads are lightly ported with a fresh performance valve job

http://www.raptorllc.net/images/LT5/LowComLt5.jpg

LGAFF

04-14-2008, 12:52 AM

And I assume that lowering compression has something to do with running the car on E85 or a lower octane in order to reduce your operating expense and reduce greenhosue gases, correct?:D

Or is it going to be a high boost LT-5 to blow the F:censored:n doors off the new LS9 motor.

I'm good with either!

LGAFF
92 ZR1
#234 :D

bradslt5

04-14-2008, 01:06 AM

aw gee , if i had to guess it would be statement number 2!!!!!!!!!!!!!!!!!!!!. what head gaskets are you going to use, how much boost. this is making me wish and drool at the same time . please no teasing allowed . congrats .looks veryt nice

RHanselman

04-14-2008, 01:37 AM

This car is a rear mount twin turbo. Boost will be tow levels, 10 or so for street and 15 or so for track days. HP will be more than the LS9 :D

www.raptorllc.net

http://www.raptorllc.net/images/Turbo/1009071824a.jpg

http://www.raptorllc.net/images/RaptorBanner%20copy.jpg

bradslt5

04-14-2008, 02:02 AM

when do you think the kit for our cars will be ready?

cuisinartvette

04-14-2008, 03:03 AM

Awesome, keep the info coming.
Where did you ge t he lightweight lifters?

tomtom72

04-14-2008, 06:32 AM

Good luck with the project!

This surely will be an impressive ZR-1......I'm soooo envious:mrgreen:

:cheers:

RHanselman

04-14-2008, 10:37 AM

Awesome, keep the info coming.
Where did you ge t he lightweight lifters?

Aaron at SGC supplied them.

RHanselman

04-14-2008, 10:42 AM

when do you think the kit for our cars will be ready?

Our projected release date for the LT1 system is 1 July. We hope to be ready with the LT5 kit 30-60 days later. Just a guesstimate... :pray

bradslt5

04-14-2008, 10:55 AM

I think that the atten to detail , to get it right first, shows the class that you all have , and that this will be a great start to a very first class company.the sts people have a great idea but have rushed their kits and used second grade parts . i have had first hand experience with this with a camero kit .your parts choices are indeed first rate . when you offer this for the zr1 i will be happy to order a kit the day you offer it to the public. please let me know when you do .:cheers:

RHanselman

04-15-2008, 10:31 PM

More Pics...

http://www.raptorllc.net/images/LT5/rebuild/eng1.jpg

http://www.raptorllc.net/images/LT5/rebuild/eng2.jpg

http://www.raptorllc.net/images/LT5/rebuild/eng3.jpg

http://www.raptorllc.net/images/LT5/rebuild/eng4.jpg

http://www.raptorllc.net/images/LT5/rebuild/eng5.jpg

http://www.raptorllc.net/images/LT5/rebuild/eng6.jpg

RHanselman

04-15-2008, 10:32 PM

http://www.raptorllc.net/images/LT5/rebuild/eng7.jpg

http://www.raptorllc.net/images/LT5/rebuild/eng8.jpg

http://www.raptorllc.net/images/LT5/rebuild/eng11.jpg

RHanselman

04-15-2008, 10:57 PM

bradslt5

04-16-2008, 01:39 AM

are you building the motor yourself , if not who is bilding it for you ??????

kenthompson

04-16-2008, 01:45 AM

If I had to guess, I'd say Gil is building it, eh Ron?

RHanselman

04-16-2008, 10:51 AM

If I had to guess, I'd say Gil is building it, eh Ron?

You bet...

I've been with him every step of the way. He knows what he's doing...

After this one we should be able to rebuild or up-grade a motor (to what we did) in about two weeks. That is after parts arrive...

BTW - most all of the well know LT5 builders have been helping us out in one way or another. Thanks guy's!

rogerzr1

04-16-2008, 11:17 PM

I read where you are looking for a few LT1/4 guys to buy the system and let your installers do the job free to work out the bugs.

I would like to offer up my LT5 for when that project needs guinnee-pigs.:D

Polo-1

04-16-2008, 11:27 PM

http://www.raptorllc.net/images/LT5/rebuild/headstuds.jpg

Thats some mighty pricey studs there

RHanselman

04-16-2008, 11:37 PM

Thats some mighty pricey studs there

$1250 and worth every penny... Let's just say there was money left in the budget after buying A26's gaskets! Thanks Jerry, You've done us all a great favor!

RHanselman

04-17-2008, 02:06 PM

http://www.raptorllc.net/images/LT5/rebuild/H3.jpg

http://www.raptorllc.net/images/LT5/rebuild/E2.jpg

http://www.raptorllc.net/images/LT5/rebuild/E1.jpg

http://www.raptorllc.net/images/LT5/rebuild/CH1.jpg

http://www.raptorllc.net/images/LT5/rebuild/V2.jpg

http://www.raptorllc.net/images/LT5/rebuild/LB6.jpg

Jagdpanzer

04-17-2008, 02:46 PM

Ron,
Great pictures and exciting project.
Are you using a 2 or 4 bolt block?

Zr1 Destroyer

04-17-2008, 07:45 PM

http://www.raptorllc.net/images/LT5/rebuild/piston1.jpg

http://www.raptorllc.net/images/LT5/rebuild/piston2.jpg

http://www.raptorllc.net/images/LT5/rebuild/piston3.jpg

http://www.raptorllc.net/images/LT5/rebuild/gaskets.jpg

http://www.raptorllc.net/images/LT5/rebuild/headstuds.jpgLooks nice, but the instructional copy from Zr1net on cam timing is not very reassuring...lol! Those head studs look like some nice insurance for cranking up the boost.;)

RHanselman

04-18-2008, 02:00 PM

Looks nice, but the instructional copy from Zr1net on cam timing is not very reassuring...lol! Those head studs look like some nice insurance for cranking up the boost.;)

Jerry and I supplied every piece of data we could plus the service manuals. All the data; manuals and the engine guy's experience w/ multiple overhead CAM configurations will be nothing but extra insurance...

RHanselman

04-18-2008, 02:06 PM

Ron,
Great pictures and exciting project.
Are you using a 2 or 4 bolt block?

2 Bolt

The motor is the original motor from my 91 blk/blk #383 w/ 14k miles.

Some of the coolest things about the bottom-end is that we could re-use the Main Bearings and Piston Rods. Our engine guy thought the Rods were beefy and perfect for boost. He cleaned up the engine bearings and then sent them out for coating. I believe he took out .0015 from both the main and rod journals to account for the coatings. They were absolutely beautiful when we got them back. Even though I had a new set of bearings there was no reason to use them because he would have coated them anyway. This will save lots of cash on future LT5 builds.

BTW - yes I will be offering both low and high compression LT5's when this is done.

Cheers,
RH

HADI-ZR1

04-18-2008, 02:19 PM

Do you hink the bolts can handle +650 hp??

RHanselman

04-18-2008, 02:22 PM

Do you hink the bolts can handle +650 hp??

Were betting on 900hp+

04-18-2008, 04:58 PM

Way to go guys !!!!! Doing an excellent job !

Zr1 Destroyer

04-18-2008, 07:20 PM

Jerry and I supplied every piece of data we could plus the service manuals. All the data; manuals and the engine guy's experience w/ multiple overhead CAM configurations will be nothing but extra insurance...Sounds like your in good hands then!!?! How did the leak down come out with those purdy heads(since the cams didn't look like they were in yet)? Can't wait to see her running......should be fun playing with that boost and 900 ponies!!!:dancing

WB9MCW

04-18-2008, 08:47 PM

Very Nice RH ---- God's Speed to ya all on the project!!!

RHanselman

04-19-2008, 12:16 PM

Almost done!

http://www.raptorllc.net/images/LT5/rebuild/C1.jpg

http://www.raptorllc.net/images/LT5/rebuild/C2.jpg

http://www.raptorllc.net/images/LT5/rebuild/C3.jpg

http://www.raptorllc.net/images/LT5/rebuild/C4.jpg

RHanselman

04-19-2008, 12:17 PM

http://www.raptorllc.net/images/LT5/rebuild/P7.jpg

http://www.raptorllc.net/images/LT5/rebuild/P6.jpg

http://www.raptorllc.net/images/LT5/rebuild/P5.jpg

http://www.raptorllc.net/images/LT5/rebuild/P4.jpg

RHanselman

04-19-2008, 12:17 PM

http://www.raptorllc.net/images/LT5/rebuild/P3.jpg

http://www.raptorllc.net/images/LT5/rebuild/P2.jpg

http://www.raptorllc.net/images/LT5/rebuild/P1.jpg