Might go with a blower, have some concerns.

[07 procharger]

Ive been tossing this around for some time now. I think im gonna pull the trigger but need some help.

Ive been looking at the 2.8 mammoth from kenne and I think im going to go with it, my only concern is how I build my engine for nitrous, will i be able to boost it?

Its the 9.6 cr livernois stroker, how many pounds can I run into this thig. also with it buing built "loose" for nitrous...will my ringlands hold?

Specs on engine build

Main bearings - .0022"
Rod Bearings - .0028" (coated bearings)
Piston to wall - .0035"
Ring end gap - top - .021" second - .025" (nitrous spec)
Rod small end - .0008"

Piston pin .0007"

Will my motor handle boost? if so how much with my clearences and compression ratio?

Thanks guys.

 

[stkjock]

what octane will you be using?

 

[07 procharger]

94 octane...sorry

 

[stkjock]

stock CR is 9.8 IIRC, So with a 9.6 CR I see no reason you couldn't run up to 12lbs.

 

[07 procharger]

thats it huh?

 

[DirtyDogOfTheDesert]

Maybe more on race gas.
Your ring gaps, and other specs are fine.

 

[RedFire07GT]

who ever your tuner is tell them to send you a race tune too. Thats if you take the car to the track.

 

[07 procharger]

so is the 2.8 overkill them, I can get 12 pounds out of 2.6 cant I?

 

[Kankakee]

Yes, you should be able to. The engine have a forged rotating assembly? I would of thought it could take more then 12 PSI.

 

[Bingo]

Couldn't you get away with a little more boost if you used a centrifugal SC or a turbo? I recall seeing higher compression ratios for those types of applications.

 

[07 procharger]

its all about the CR and octane of fuel I thought when it came to boost...and ya im forged

 

[DirtyDogOfTheDesert]

It's going to come down to tuning, and how "on the edge" you are willing to risk being at.
You can run more total boost with a centri, but a centri at 18psi boost, isn't at 18psi at the hit of the go pedal. They build boost linearly with rpm, where a TS, or Roots style blower are at max boost when you hit regardless of engine RPM.

 

[07 procharger]

i want to be able to see the edge...but not fall off of it. And ya its roots style ..no centri for me.

 

[stkjock]

my comment on the 12lbs was a conservative suggestion, certainly based on the mods you have on 94, 15 is reasonable from my knowlegde

 

[07 procharger]

so 15 pounds will give me an extra 150 horse? based on the 100 horse per every 10 pounds?

 

[stkjock]

so 15 pounds will give me an extra 150 horse? based on the 100 horse per every 10 pounds?

I don't think you can make such a simple calculation.

My car @ 10lbs made 435 - so up about 150 from stock, at 12lbs it made 460. Stock heads, cams and exhaust.

 

[07 procharger]

wow ok , thanks, im looking for around 550 to 600 on 15 pounds.

 

[DirtyDogOfTheDesert]

so 15 pounds will give me an extra 150 horse? based on the 100 horse per every 10 pounds?

Wrong! HP will "approximately" double every 12psi of boost over your NA HP levels.
300 HP NA with 12 psi boost = 600 (crank) HP
300 HP NA with 24 psi boost = 1200 (crank) HP ....Ballpark figures many other variables to take into account.

Who do plan on using for tuning?

I'm just outside Edmonton, PM me, I can help you out with your plans. I've been over the edge a couple times, and have a pretty good idea where it is now.

 

[07 procharger]

wellllllll. Mathew out of Calgary did my last tune...but thats just a N/A tune with 4 degrees knocked out for the nitrous. i was thinking of Lightspeed out of Red Deer here...you know of someone good?

I run Diablo.

 

[s8v4o]

I don't think you can make such a simple calculation.

You can but they are never 100% accurate. There are usually ballpark numbers to play with. Without looking these up I may be a little off but expect to see

6-12 HP per psi 4cyl

12-18 HP per PSI 6 cyl

18-25 HP per PSI 8 cyl

Again these are NOT EXACT numbers and these numbers start to change when the boost gets high.