What's the compression on a '98 GT?

GDawg · Aug 3, 2006

I thought is was something like 10:1 and 99+ is something like 9:1... not sure about the specifics but if you can tell me anything and everything and point to somewhere I can verify the facts that would be cool. A guy at work is questioning the Mustangs.

Gearbanger 101 · Aug 3, 2006

Everything you want to know about '98 4.6L GT specs....
http://www.dariusrudis.com/mustang/must98/

CobraRed_96_GT · Aug 3, 2006

in conclusion, 9.0:1

Skidzz · Aug 4, 2006

They are both 9:1. The 96-98's jump to 10:1 after the PI swap because of the difference in pistons.

four six · Aug 4, 2006

yup 10:1 is after the PI swap

Gearbanger 101 · Aug 4, 2006

Closer to 10.4:1 actually....but either way, it's gonna be a problem for a regular gas, or a blown engine.....but great for nitrous.

Pennywise2 · Aug 5, 2006

Gearbanger 101 said:
Closer to 10.4:1 actually....but either way, it's gonna be a problem for a regular gas, or a blown engine.....but great for nitrous.

Yep closer to 10.4:1 - 10.5:1.
Nitrous loves compression that's for sure Brain.

04DarkShadowGT · Aug 5, 2006

Yes nitrous does love a PI swapped motor

GDawg · Aug 6, 2006

Thanks for the responses guys. That's where I got that 10:1 from... the PI swap.

What's the compression on a '98 GT?

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What's the compression on a '98 GT?

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