Mercury Racing Class I Engine
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02-12-2005, 08:48 AM
#5
Re: Mercury Racing Class I Engine
I grew up around dirt modified stock cars so that is what I thought all big blocks looked like. I think sometime in the 80's they changed the rules to disallow injectors. They burned alcohol. Very fast. Doug
02-12-2005, 09:24 AM
#6
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Re: Mercury Racing Class I Engine
That motor will run fine on 110 octane leaded. I would not try to run less than that. 114 or greater may actaully hurt the performance and your wallet, but the motor will be OK. That motor really shows the performance potential of custom Big Chief heads. Try to get 850 HP out of 500" NA with conventional BBC heads for a marine application and it would be very difficult even at 12+ compression! 
02-12-2005, 10:27 AM
#7
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Re: Mercury Racing Class I Engine
I know they are Crane solid rollers, but I don't know the specs. That type of EFI would look so cool on my 598!! I wonder if it is coast guard approved? 
I wonder if it is coast guard approved?
02-12-2005, 12:01 PM
#8
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Re: Mercury Racing Class I Engine
well.. i'm curious to run it on the water... its in a 2600 NXS AO, with a bravo drive...1.36 i heard it run on the hose in the yard and I was very impressed..
Don
Don
02-12-2005, 12:09 PM
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Re: Mercury Racing Class I Engine
I have 2 sets of intake manifolds off those engines. 1 is complete and other three missing miss parts. Saving them for a big inch natty project. Probly use different fuel railes and BIGSTUFF 3,ACELL GEN 7, or F.A.S.T. ecm's.
02-12-2005, 10:51 PM
#10
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Re: Mercury Racing Class I Engine
I coverted a pair to pleasure use. Dropped compression down to 9.5, put on a dominator, and made 750 at 6800 at Eickert's. Then found out the stick was just a little too big and solid roller lifter life was around 25-30 hours. So we changed out to a smaller cam and did some other things to get life to 100+ hours. Life was good again. Then decided the injection would be cool, put the injection back on and set up with the FAST system. which is programable. The std Merc ecu is not. There are some components of the electircal system as well that are now NLA. The injection was not real user friendly. Sold the heads and injection and put on some Canfields with blowers and forgot about messing around any more The stock Merc Class 1 setup in front of a Bravo may be tough as the motor likes an idle around 1000-1100. The Bravo will not 
The stock Merc Class 1 setup in front of a Bravo may be tough as the motor likes an idle around 1000-1100. The Bravo will not
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