1991 2.5 200hp black max compression

Boblester40

Boblester40

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Aug 16, 2007
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112
Hi ..
Anyone know what the factory compression for a 1991 200hp 2.5 black max, I have around 120psi on all pots but was woundering if it was worth re-ringing when i take the powerhead to paint and fit my alien cowling i have just got ?


Thanks
bob
 
Dukedog

Dukedog

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Oct 6, 2009
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Re: 1991 2.5 200hp black max compression

If its a real '91 2.5 then absolutly. That motor is gettin' ta be pretty rare. If its an efi motor it will be real close to tha 225 ProMax without all tha bolt on's. Just painted.................
 
Boblester40

Boblester40

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Re: 1991 2.5 200hp black max compression

Thanks for the reply , it is a 1991 2.5 ltr for sure , i dont understand what you mean so is 120 psi low ?


rgds
bob
 
S

sschefer

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Nov 13, 2008
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Re: 1991 2.5 200hp black max compression

Bob, I think DD is trying to tell you how lucky you are. Extremely easy motor to make go fast :D and it's hard to find one that hasn't been mod'd.

You gotta know my thoughts on re-ringing would be yes if the engine is stock original. Depending on the hours, you might look at this as a winter opportunity and go ahead and get the bores checked, honed and do a baseline rebuild.

I think the stock compression is in the 125-130 range.
 
Faztbullet

Faztbullet

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15,618
Re: 1991 2.5 200hp black max compression

The 91 came from factory with the 14 pedal intake instead of a 10 pedal this is why its rare...
 
Dukedog

Dukedog

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Re: 1991 2.5 200hp black max compression

Do a leak down. If that comes out good and its running good, it ain't broke so just run it. Just do a leak down and comp. test a little more often and take care of it. Unless ya just want something ta do while its cold.............D

120 is ok.
 
Boblester40

Boblester40

Petty Officer 2nd Class
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Messages
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Re: 1991 2.5 200hp black max compression

OK thanks for the replys , I dont know the history of the enigne or the number of hours , I think i will strip the powerhead and re ring and check it over due to this as it wont take to to long , I should not have to replace all the bearings hopefully .

rgds
bob
 
JB

JB

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Mar 25, 2001
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45,907
Re: 1991 2.5 200hp black max compression

Re-ringing that engine would be a complete waste of time and bux. It is fine.

Find some other make-busy project to burn up the winter months.
 
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