so, i am picking up a 2001 cobra next week. i'm excited as hell to be back in a mustang. only thing is it may need an engine, but i'm getting a hell of deal, so i am ok with that. question is, i have a low mileage 2v engine in my garage. can i put the short block from this engine in the cobra? i know there are some things about compression ratios and such depending on which short block you use with the 01 4v heads, but i can't remember what it was.
2001 cobra, questions about short blocks
- Thread starter brando95
- Start date
The heads will bolt on. Compression will be low. I had a set of 2V pistons and if I had used them compression would've been in the 8's I think. Add in that it's an iron block and the crank is a cast 6 bolt set up I'd skip using that short block.
Mach 1s and Aviators are the two main engines people use. But you'd want to find one out of a Mach with a manual trans. They're the ones with a steel crank. The auto Mach's use a cast crank. I'm not sure about the Aviator.
putting a 2V GT motor in a born Cobra is sacrilege, at least put a 03/04 Mach 1 with the forged crank or a 99-01 Cobra 4V
here's deal. after i buy the car, it will take me a while to save the money to rebuild the cobra engine to how i want it built. what i want to do is drive the car while i am saving money to build the engine. my thoughts are that i would take the 2v short block, swap all the cobra stuff over to it, install it and run it until i can save the money to build the original engine. here is where i need help. i know that the c heads on 2v engines effects the compression ratio depending on whether or not the c heads go on a NPI or PI short block. i have read that c heads on a PI short block really lowers the compression ratio, making it a dog in NA form. conversely, i read that NPI short blocks with the c heads have a compression ratio that is quite close to the original cobra engine, making it good for NA applications. anybody have any thoughts on this? i know this is going to cause me more work, i honestly do not mind the work. IF the car needs an engine, i would really like to be able to drive it while saving to rebuild the original cobra engine, instead of just letting it sit and rot.
You will be around 9:1 compression with an NPI shortblock and a little lower than that with a PI (01-04). That is a large difference and will result in a large reduction in power compared to a factory Cobra. You'd be down 20-30rwhp in a car that makes less than 300rwhp stock.
Doesn't sound like a problem if you need just a temporary fix
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going to a cast crank engine will not be a step back in performance or capability as the rods and pistons will break long before the crank.
Mach 1, aviator, and marauder engines would be suitable replacements.
A PI 2v shortblock will result in an 8.8:1 compression ratio. If yours is an NPI the CR will be much more tolerable.
Mach 1, aviator, and marauder engines would be suitable replacements.
A PI 2v shortblock will result in an 8.8:1 compression ratio. If yours is an NPI the CR will be much more tolerable.
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