Baja 272 w/ 502EFI won't spin over 4500rpm with Mirage Plus 23
08-04-2013, 09:20 PM
#11
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if you do not put the computer in service mode when setting the timing you will junk your engine unfortunately i know this the hard way had a major brain fart a few years ago
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08-05-2013, 09:27 AM
#12
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Location: Rochester, NY
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You did a tune up because the wires were ARCING?? I would change the cap, rotor ,plugs and check the timing if you haven't as they may be all fouled out IF it was that bad. Do a compression check while you are changing the plugs, you might have a few cylinders just along for the ride and if timing is retarded it might really need a timing chain and or distributor gear. When you did this tuneup did you have the cap off distributor, the 272 Bajas have a problem with water dripping directly on the distributor (rots inside) and coil when people come in and out of the boat swimming and this has caused a lot of problems on mine. The computer isn't going to tell you a whole lot as it doesn't have a 02 sensor or fuel pressure transducer, it will only show a few simple fault codes and they are rarely the cause of major loss of top speed, Smitty
I'm hoping I can run it easy for the rest of the season and refresh the top end over the winter.
08-29-2013, 06:42 PM
#13
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Well, I did a compression check. #2 has 20psi, #4 has 25psi. It's coming out after this weekend for a teardown. The rest varied from 75-130 psi. Time for a refresh.
I'm looking for opinions on what to do while I'm in there. I would like to build it up a little bit, but I don't want to lose driveability. Maybe 500HP? Or should I just do a refresh to what it was when it was new? I would be happy (for now) with high 60's.
Thanks!
I'm looking for opinions on what to do while I'm in there. I would like to build it up a little bit, but I don't want to lose driveability. Maybe 500HP? Or should I just do a refresh to what it was when it was new? I would be happy (for now) with high 60's.
Thanks!
08-29-2013, 07:22 PM
#14
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There are a lot of builders that have a tune, cam, and head work package to make 525HP or so. Basic combo that doesn't decrease engine life.... too much anyway. They will want you to upgrade fuel system and manifolds while you are at it.
See if you can find a take off extrude honed intake.
See if you can find a take off extrude honed intake.
