slick1851

Not a daily driver, but im looking to stay on pump gas the motor might be a stock cube LT1 or a 355


Ill be using GM pink rods, and speed pro pistons possably with a stock crank


Just going to ring the **** out of it while being on a budget




NOT A DAILY DRIVER! Weekend/street cruiser

98pontiacfirehawk

This may not be the answer your are looking for but I am running 11.5 with no problems. If you plan on running 12.1 you going to need a pcm reprogram any way so the programmer will know what to do to help from spark knocking.LT1 reverse flow is nice, we can get away with more compression than others on 93 pump gas. Also, I would not recommend the stock internals at all with that much compression.

Ray@Nitrous Outlet

I ran 12.2:1 on 93 octane pump gas in my 94 from 2003-2007....no issues

97AGGIE

iTrader: (1)

I agree. I run just under 13:1 on pump gas and can even get away with a 75 shot without any detonation. All in how the car is programmed. I also would agree w/the comment on better internals (something better than speed pro pistons). I would at least do SRP's if not JE's. Just IMO.

daniel6718

iTrader: (36)

nitrous loves compression....from what i heard lt1 with reverse cooling can run more compresssion on pump...you can with any motor just ahve to take out timing...i would run 12-12.5:1 without hesitation...its in the tune

slick1851

Cool thanks alot guys thanks for the info, I just wanted to double check

Matts94Z28

iTrader: (6)

Im running slightly over 12:1 comp with a CC306 on 93 with no issues what so ever.

dhdenney

iTrader: (53)

Well your dynamic compression ratio is what counts. Run a search for Pat Kelley's calculator. You'll need your cam card and other specs like deck height (piston in or out).

Grease

As said above, dynamic compression is more important. I run 12.36:1 compression on 93 octane and I logged 39 degrees of timing with datamaster at the track with no knock retard whatsoever. However I have a cam that bleeds of a lot of the compression.

TwoFast4Lv

iTrader: (8)

Been doing it for years. The key is a big cam

383lt1impala

iTrader: (33)

yup thats y gm did the reverse cooling in the 1st place even tho stock they dont have a whole alot of it..

Dave J

iTrader: (2)

I am starting to wonder if I can run less octane than the 110 that I am running now after listening to you guys. I dont know the dynamic compression but the static is 13.6:1 but I have a big cam so I might try 50/50 race fuel and pump gas and see how it goes

btw the cam is 264/271 .688/.660

matt94z

iTrader: (49)

12.5:1 here no problems

dhdenney

iTrader: (53)

Dig out your cam card and give Kelley's calc a shot. If DCR is less than 9, then 93 should be do you fine.

-PEPE-

iTrader: (10)

12:5:1 pump gas here, but she loves the race fuel..I always mix it thought with the 93.

T/ALT1

iTrader: (3)

You would be fine with a 50/50 mix but I don't know if I would run it hard on straight 93 with that much compression. How much timing are you guys running on 93? Mine runs on straight 93 and I have 35degrees total. Thanks Clint

infinitebird

iTrader: (11)

Should be fine. If you do have any issues just pull a little timing and you're all set.

FASTFATBOY

iTrader: (23)

12.77 here on 93 pumpgas.

D

Jditlfm

iTrader: (26)

Care to elaborate as to why, and how you came to this conclusion?

FASTFATBOY

iTrader: (23)

Some Orsca Outlaw 10.5 shootout cars run upwards of 15 to 1 with 5 FIVE stages of nitrous...1000 hp of nitrous.

David