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Topic Review (Newest First)
08-10-2012 07:41 PM
joelster My cam is a custom grind from LSM. Small base circle, altered firing order, solid roller.
08-08-2012 05:30 PM
joelster
Quote:
Originally Posted by Eric63M View Post
That is the shootout. Don't think this year is going to happen unfortinatly. After all the set backs and going extremely over budget on this build I'm not sure if it will be together in time, this is how its sitting so i still need to tune it massively, and dial in the rear suspension.



Next year for sure will be competing, this year if possible i will trailer it out and see. What is the index for mod N/A and any restrictions? I'm sitting with a S60, twin plate clutch, stage 4 t56, 10pt cage, and this engine i'm building. and only weigh in at 3085lbs with my last engine (without me) so 3300 with me in it roughly. Any fuel limitations?

btw your car sounds good, which cam do you have in there?
Mod N/A is fairly open to whatever you want to do. There is no index. Run as fast as you can. It's heads up on a .400 pro-tree. The weight limit is 3075lbs WITH driver. Any race fuel you want to run, and aftermarket pcm. To be competitive you should be well into the 10's. Last years winner was running 10.29-10.40, but keep in mind it was 100 degrees out.

The full rules are right here:

Quote:
LTX Modified N/A
Limited to quickest 32 qualifiers. Must have LT1-based engine. No power adders permitted. Heads must retain the factory 23 deg valve angle. Trick Flow 21 deg. heads permitted (PN TFS-30400008-M54). Converted intakes, stock and sheet metal permitted. 30" maximum height and 10" maximum tread width for bias-ply tires. W's limited to 28". 29.5 x 10.5 bias-ply permitted with 150 lb. weight penalty. Drag radials permitted. Non-stock style suspension permitted. Mini-tubbing permitted. Wheelie bars not permitted. Aftermarket EFI, LS1 PCM and carburetors permitted. Any GM transmission allowed. Lexan windshields not permitted. Independent rear suspension receives weight break of 200 lbs. Manual transmission receives weight break of 100 lbs. Minimum race-weight limit 3,075 lbs. Car and driver must meet NHRA certifications for the time the car is running.
08-07-2012 10:25 PM
cdminter59
383 LT1 what ring gap?

Here is JE's website. The ring gaps are listed in the tech corner. http://www.jepistons.com/PDFs/TechCo...instrc2618.pdf
08-07-2012 07:40 PM
Eric63M That is the shootout. Don't think this year is going to happen unfortinatly. After all the set backs and going extremely over budget on this build I'm not sure if it will be together in time, this is how its sitting so i still need to tune it massively, and dial in the rear suspension.



Next year for sure will be competing, this year if possible i will trailer it out and see. What is the index for mod N/A and any restrictions? I'm sitting with a S60, twin plate clutch, stage 4 t56, 10pt cage, and this engine i'm building. and only weigh in at 3085lbs with my last engine (without me) so 3300 with me in it roughly. Any fuel limitations?

btw your car sounds good, which cam do you have in there?
08-07-2012 07:03 PM
joelster
Quote:
Originally Posted by Eric63M View Post
thanks for all the replies.

Joelster - for this season i'm limiting it to 125hp worth but next year its game on. I'll be competing in a LTX shootout and going into the power adder class and running 350 direct port shot. For this season its just going to stay at 125 and making sure i can get the power to the ground. Would you say gap for the 350 now or at the end of the season when i tear it down?
This shootout?????


^^my car is the camera car. Might not be a shootout next year. Run it N/A this year and I will see you in Mod N/A!
08-07-2012 07:33 AM
ap72 I'd get a set of gapless from total seal. they work great and pick up a few hp. i run then in my more serious builds.
08-07-2012 07:03 AM
Eric63M Thanks for the replies everyone.

68nova - I'll call the manufacturer today and see what they recommend.

engineczar - The pistons are forged JE -5cc flattops. then for the rest of the bottom end a Callies magnum XL crank and H beam rods.
08-07-2012 05:23 AM
engineczar The merge is complete.

I'm on board with 68's recommendation unless the pistons are KB Hypereutectic's in which case you need even more gap on the top ring.

What type piston are you going with?
08-06-2012 10:46 PM
68NovaSS IMHO, I second those gaps are too tight, especially for nitrous, and even a NA.

JE recommends:

Street turbo or nitrous, bore x .0050, bore x .0055 1st and 2nd rings and .015 oil. That's .020 and .022 for a 4.030 bore.

Nitrous race only even wider, .0070 and .0065 per inch of bore.

If you wanted tightening them up a bit, I would never go tighter than .0040 and .0045, top and second ring with NOS regardless of the ring material. Myself, I wouldn't deviate from the manufacturers recommendation.
08-06-2012 09:26 PM
Ripper 410 exactly he didn't ask for piston clearance he asked for ring gap and plasma molys can be run alittle tight
08-06-2012 09:08 PM
327NUT This is a double post.........and .008-.010 top .009-.012 second???????????????? he's going to run nitrous!
08-06-2012 08:40 PM
Ripper 410 I'd run plasma molys and set the gap .008- .010 top .009-.012 second
08-06-2012 07:34 PM
Eric63M thanks for all the replies.

Joelster - for this season i'm limiting it to 125hp worth but next year its game on. I'll be competing in a LTX shootout and going into the power adder class and running 350 direct port shot. For this season its just going to stay at 125 and making sure i can get the power to the ground. Would you say gap for the 350 now or at the end of the season when i tear it down?
08-06-2012 07:20 PM
joelster
Quote:
Originally Posted by vinniekq2 View Post
dont forget to add for the NO2
You won't need to alter the ring gap if you are only planning a sub 200 shot. Once you get addicted to the sauce and want to put the big boy jets in, then ring gap becomes critical.
08-06-2012 02:42 PM
vinniekq2 dont forget to add for the NO2
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