compresison ratio

[88_GT_5_oh]

anyone know what the stock compression ratio is on a 5.0 mustang?


i can't beleive i have to make a thread for this but the search function sucks and i can't find anything on google and it keeps looping me back here, just need it for reference

thanks

 

[FordGuy88]

I believe it is 9 to 1 or 9.5 to 1

 

[88_GT_5_oh]

i thought 9:1 was stock, and my buddy thinks its 9.5:1


just trying to settle a dispute. theres a beer on the line here lol

 

[88_GT_5_oh]

c'mon boys....

 

[luckythirteen13]

ive always heard its 9:1

 

[vikingpower]

In my 5.0 mustang technical reference manual it calculates out to 8.8:1. I can post the exact details if you want them from the book.

 

[88_GT_5_oh]

sure

and if it is 8.8:1 you get the beer casue both me and my buddy were wrong

 

[FourG63 97GST]

does anyone has a staight answer, i'm new to the stangs an has been looking for a few days now

 

[Gearbanger 101]

Depending on the year of the engine, if memory serves, the configurations are as follows for the HO "roller" engines.....

'85 5.0L HO was in the 8.8:1 range (Flat tops with valve relief’s, slightly larger combustion chamber E5AE heads)
'86 5.0L HO was in the 9.2:1 range (Flat tops, no valve relief’s, closed chamber E6SE heads)
'87-'93 5.0L HO was in the 9.0:1 range. (Flat tops with valve relief’s and E7TE truck head)

 

[txstang84]

Depending on the year of the engine, if memory serves, the configurations are as follows for the HO "roller" engines.....

'85 5.0L HO was in the 8.8:1 range (Flat tops with valve relief’s, slightly larger combustion chamber E5AE heads)
'86 5.0L HO was in the 9.2:1 range (Flat tops, no valve relief’s, closed chamber E6SE heads)
'87-'93 5.0L HO was in the 9.0:1 range. (Flat tops with valve relief’s and E7TE truck head)

 

[88_GT_5_oh]

holy thread revival........ and i forgot i never got an answer to this lol.


thanks gearbanger

 

[Dean85GT]

My 85 seems to be very blower friendly. Its a shame if I do it I gotta do a blow through carb or get a holley 174...Which will stick like 2 feet over my hood.

 

[Gearbanger 101]

Paxton makes a nice bonnet for a blow through set up....but it isn't cheap.

 

[vikingpower]

8.8:1! end of arguement!

 

[Gearbanger 101]

8.8:1! end of arguement!

No it isn't Mr Know-it-all, because it's a well known fact that the '86 HO with flat top pistons and closed chamber heads had a slightly higher CR than any other year. Saying that all years boasted the same CR is just plain wrong!!! It wouldn't be the first time I've seen a technical reference manual post incorrect figures......and this is another one of those times.