i told them im using oem gaskets :shrug:
The stock 03/04 head gasket is thicker than the n/a cobra gaskets.
i told them im using oem gaskets :shrug:
I thought compression ratio and boost was restricted by fuel. Not so much boost. If you have the proper fuel(s) I thought your budget was the limit. I've seen builds with 12:1 and 13:1 compression and upwards of 20+ PSI of boost on E85 and E98. Or am I missing something here?
The stock 03/04 head gasket is thicker than the n/a cobra gaskets.
What is the oem compressed gasket thickness for both? I can't find it anywhere.
They are using a thinner head gasket and a shorter deck clearance.
I thought compression ratio and boost was restricted by fuel. Not so much boost. If you have the proper fuel(s) I thought your budget was the limit. I've seen builds with 12:1 and 13:1 compression and upwards of 20+ PSI of boost on E85 and E98. Or am I missing something here?
In response to my first post. I did say not the " most efficient "... With his compression I wouldn't think he would lose large amounts of torque with a little bit of cam tuning. Of course, I realize that does have to do with where they are now. And, NA is absolutely correct. It has been proven time and time again more compression makes more power. Period!!! You can get into a lot different variables and arguments, but, compression makes power. As for the manifold pressure of "only" 5 psi. My Cobra when I got it was remanned with a 9.1:1 compression build and everything else stock. I got it retuned and did some playing with it. Stock intake manifold, BBK 62mm throttlebody shorty FRPP headers, Bassani X with cats and Borla mufflers. 412HP at the wheels with a mere 5 1/2" @ 6500 rpm. I do not know what the cams are degreed at otherwise. I would say at a completely stock location with the sprockets. So pressure, at almost any amount does make a difference...
With a good tune a forged flat top will hold up fine. These engines are not the archaic engines of the 60s, they much better combustion chambers, better materials and hellish better engine management systems, 10:1 is absolutely safe with moderate boost.
one thing i was reading a on this site months ago is that running high compresion and low boost will result in higher cylinder temps at tdc. idk the exact increase i just cant remember but my new motor is 10.0-1 and will be at 14psi on the eaton. im getting tuned for 91 with meth since there isnt alot of e-85. seams better than 8.5 at 18psi and heat soaking your blower.
one thing i was reading a on this site months ago is that running high compresion and low boost will result in higher cylinder temps at tdc. idk the exact increase i just cant remember but my new motor is 10.0-1 and will be at 14psi on the eaton. im getting tuned for 91 with meth since there isnt alot of e-85. seams better than 8.5 at 18psi and heat soaking your blower.
Yes 10.0-1 at 14psi is way to much for pump gas if you aren't running a ridicules safe tune. That's why I will be running the meth to boost the octane of my fuel. And talking about a stock 03-04 motor making more power with max boost than a n/a cobra you have to consider the forged vs. non forged bottom end. The forged will take a lot more aggressive tune. But a forged 10.0-1 motor should be able to handle an aggressive tune with 14psi. I guess ill see what she makes when I get my tune.
And how is a 03-04 cobra motor at 8.5-1 with a 2.9 or bigger running 22+ psi any different. Maybe my comparison on the numbers isnt exact but the concept is
I have posted this diagram here before but I thought I would show it on this thread to illustrate the difference in what the combustion chamber sees "high compression vs. low compression" on an FI engine. .