4.6 build how high of compression can it take?

Ryan441 · Dec 31, 2008

i need a new motor. im thinking about rebuilding my 4.6 but it really needs to make SOME power. how high of compression can i run . i was thinking 13.0 - 13.5:1? is a 5.1 stroker kit worth the money?

98COBRA281 · Dec 31, 2008

Ryan441 said:
i need a new motor. im thinking about rebuilding my 4.6 but it really needs to make SOME power. how high of compression can i run . i was thinking 13.0 - 13.5:1? is a 5.1 stroker kit worth the money?

i wouldnt go that high, because then you cant just use 93, it will ping ike a b#%^c

SaleenGT2001 · Dec 31, 2008

go with 8.5 - 9.0:1 and add boost. you will make more power

squeak93 · Dec 31, 2008

Unless u want to run race gas I wouldn't go over 11:1 n/a. Or as stated above build a low comp blower motor and go faster.

Ryan441 · Dec 31, 2008

i dnt have money to put a blower or turbo on it other wise i would have done that in the first place and wouldnt have had to run it has hard and prob not blowin it up.
im pretty sure you can run 12.5:1 on 93 and than just put some cam2 in it to race it. and i know nitrous likes high compression. if you your telling me the only way to make power is threw boosting a 4.6, i think i will go to a 302 or maybe a 351

Ryan441 · Dec 31, 2008

stock ls1 comes at 10.88:1 from the factory

LastCallRacing · Dec 31, 2008

How much power you want is the main question.

We prefer lower compression and high boost too, it's the only replacement for displacement...lol

However, not everyone has that build in their budget. I say keep saving personally, but if you are ready to do something with what you have, a nice 10.5:1 compression motor with ported heads and nice cams and headers is the best idea. You will gain plenty of power, and could run a small amount of boost one day, thowing in a bit of the race juice of course.

SaleenGT2001 · Dec 31, 2008

mod motors LOVE boost. you prob wont be even close to 350 rwhp with a FULLY BUILT N/A combo. with spray you may see 500.

there was an intercooled Novi2K kit on MPH for under 4K. cant get much cheaper than that. i can tell you for a fact the 2K will make some power

TGJ · Dec 31, 2008

SaleenGT2001 said:
mod motors LOVE boost. you prob wont be even close to 350 rwhp with a FULLY BUILT N/A combo. with spray you may see 500.

Really, I am at 360 RWHP with a N/A 2V auto and it is NOT a fully built N/A combo. I don't have UDP's or a CAI or long tube headers and am under 11:1 compression using 91 Octane fuel...

TGJ · Dec 31, 2008

The most I would go is 11.5:1 Compression on 91-94 Octane fuel with a good dyno tune. If I was capable of writing my own tune and don't have any problems occassionally fine tuning it, I would run 12:1 on 91 - 94 Octane fuel.

01TrueBlueCobra · Dec 31, 2008

TGJ said:
Really, I am at 360 RWHP with a N/A 2V auto and it is NOT a fully built N/A combo. I don't have UDP's or a CAI or long tube headers and am under 11:1 compression using 91 Octane fuel...

I call total BS. I didn't make 320rwhp on my full bolt on 4V and you're saying you make 360 on a NA 2V through an auto. Until you provide a dyno sheet and video I will say you're full of sh**

98COBRA281 · Dec 31, 2008

01TrueBlueCobra said:
I call total BS. I didn't make 320rwhp on my full bolt on 4V and you're saying you make 360 on a NA 2V through an auto. Until you provide a dyno sheet and video I will say you're full of sh**

no, he realy made 360 rwhp N/A npi auto.... if i remember correctly its a big bore kit........

SaleenGT2001 · Dec 31, 2008

i've only seen a handful of built mod motors break 400 N/A.none of them were 2V, not saying it cant be done, but boost is SO much easier and will yield better results for the money

01TrueBlueCobra · Jan 1, 2009

98COBRA281 said:
no, he realy made 360 rwhp N/A npi auto.... if i remember correctly its a big bore kit........

If that's the case you don't know what you're talking about. A stock NPI auto won't even make 200 rwhp. How is he going to gain over 160 to the wheels with just a big bore. There are guys at svt performance that have 5.0L big bores in their 96-01 Cobra's and not even making 360rwhp through a manual and 4V heads. Even if he had ported heads and stage 2 cams he won't make 360 rwhp, especially through an auto. Until I see a dyno sheet this is BS. That's why I haven't posted here in over 2 years, because of stupid sh** like this, feeding the thread starter false info.

98COBRA281 · Jan 1, 2009

01TrueBlueCobra said:
If that's the case you don't know what you're talking about. A stock NPI auto won't even make 200 rwhp. How is he going to gain over 160 to the wheels with just a big bore. There are guys at svt performance that have 5.0L big bores in their 96-01 Cobra's and not even making 360rwhp through a manual and 4V heads. Even if he had ported heads and stage 2 cams he won't make 360 rwhp, especially through an auto. Until I see a dyno sheet this is BS. That's why I haven't posted here in over 2 years, because of stupid sh** like this, feeding the thread starter false info.

i will bet you, he made it....... it a big bore kit, renagade racing P&P npi heads(whick flow better then almost all ported pi heads) big cams, and i think he has mid tube headers, ect.... HE REALY PUT DOWN 360RWHP, DONT BE MADE CAUSE YOUR 4V CANT EVEN COME CLOSE!!!!

good, dont post for 2 more years, we wont miss you..............

V_Eight · Jan 1, 2009

Bench racing. Awesome.

Slow35th · Jan 1, 2009

98COBRA281 said:
i will bet you, he made it....... it a big bore kit, renagade racing P&P npi heads(whick flow better then almost all ported pi heads) big cams, and i think he has mid tube headers, ect.... HE REALY PUT DOWN 360RWHP, DONT BE MADE CAUSE YOUR 4V CANT EVEN COME CLOSE!!!!

good, dont post for 2 more years, we wont miss you..............

is there dyno #s to prove this?

V_Eight · Jan 1, 2009

Oh, and it costs a hell of a lot more to make a beefy NA mod motor than a blown motor with more power.

SaleenGT2001 · Jan 1, 2009

V_Eight said:
Oh, and it costs a hell of a lot more to make a beefy NA mod motor than a blown motor with more power.

BOOST is cheaper in the long run!

01TrueBlueCobra · Jan 1, 2009

TGJ said:
Really, I am at 360 RWHP with a N/A 2V auto and it is NOT a fully built N/A combo. I don't have UDP's or a CAI or long tube headers and am under 11:1 compression using 91 Octane fuel...

As you see in this post he said he doesn't have a fully built N/A combo

98COBRA281 said:
i will bet you, he made it....... it a big bore kit, renagade racing P&P npi heads(whick flow better then almost all ported pi heads) big cams, and i think he has mid tube headers, ect.... HE REALY PUT DOWN 360RWHP, DONT BE MADE CAUSE YOUR 4V CANT EVEN COME CLOSE!!!!

good, dont post for 2 more years, we wont miss you..............

You say he does. Ether way he wasn't honest with the thread starter. Also since I haven't been here in 2 years I didn't update my SIG. Well I updated and as you can see My 4V far exceeds the 360rwhp mark on stock Heads and CAMS. I apologize for being an a**, but like I said before I believe dyno sheets

4.6 build how high of compression can it take?

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