difference between a sst140 & 2.4 efi bridgeport

[C-C]

what is the main difference between a sst140 2.4 block and a 2.4 efi (89-91) hi-perf block.. or are they both the same block. i believe the 2.4 efi blocks are all bridgeport blocks from 89-91 from mercury racing. i know the sst140 turns left and runs on carbs and the 2.4 was available in carb and efi. but what 2.4 block would be the best to build a 2.4 drag motor with,, is there anything better than these 2 blocks,, would a 83 2.4 block bet a better choice,,, its going to be a drag motor set up with efi. just curious about the 2.4 motors.. any help would be appreciated.. thanks cc

[us1]

The EFI, flywheel and the starter

[CompKing]

The sst 140 had a 10 pedal reed front half and the carb BP had 14 pedal.

[us1]

That is true too.

[Varmint]

John how difficult toi know it's a 14 yr. Old post, lol change it back to a righty ?

[us1]

A lefty motor to a righty motor only needs a flywheel and a trigger arm on the throttle linkage. Of course the lower unit would also have to be a righty.

[90 5.0]

John what would happen if a left flywheel was on a righty stator and trigger?

I'm having some weird charging issues and wondering if I somehow got a left flywheel on, or maybe even a 9amp.

Its a really old tiny looking merc alum flywheel.

[us1]

I also forgot you need to change the starter too. The trigger and stator will go right or left. You can't have a left flywheel on a right motor it wont even start. You can't set the timing.

[90 5.0]

Why wouldn't it start? And I can't tell what the hand made timing marks mean, we set it for max timing it's on a pieced together motor for 1/8th mile we just max the timing out and have no idea where it is for 1/8th mile. Maybe 29-30 deg??

[us1]

You can't set the timing on a left flywheel when installed on a right hand motor. That is the difference between the two. If you could set the timing in either direction there wouldn't be a need for two different flywheels.

[90 5.0]

John,

i hope I'm not sounding argumenitive , I just trying to figure out why. Since as I understand it the flywheel itself has zero effect of the timing. Other than reference to where the crank is at correct? The timing is adjusted when the trigger arm is moved with the throttle linkage the flywheel spins around and the stator references it by the magnets?

Or or is there something else happening there? I really don't know and am starting to think this flywheel is not what I thought it was, thought it was a 16amp right off a sst 120 but it might have come off a 2.0 f1 if it came out of the wrong old pile??!!??

oh and it's like 1/8th inch less in diameter than my other flywheels, I had to cut the starter biscuits down in the mount to get the starter to engage so it would run.

[CNC_Guy]

The small wheels use a different bendix. The timing is locked at what you want full advance to be.

[us1]

The flywheel has a magnet built in to its hub. It tells the trigger when to fire. Left and right flywheels have the magnet in different orantations. The magnets around the parameter of the flywheel are strictly for charging and powering the switch boxes.

[90 5.0]

Thanks John that makes sense.

On the small flywheel bendix remark, I'm using a drag trigger and when i make changes to the timing arm setting it does change the timing, i take some timing out when going cruising , I just back it out two turns and you can tell a big difference in the punch. Although I have no idea where that puts it? Maybe 18-20 degrees or maybe even lower??

is it possible this is a 9amp? That would explain my charging issue.

[us1]

It possible the stator is 9 amp.

[90 5.0]

It possible the stator is 9 amp.

The stator was a brand new in the box merc 16amp stator.

[us1]

Well ten that answers your question, its 16 amps.

[Varmint]

The EFI, flywheel and the startertks John,

[90 5.0]

Well ten that answers your question, its 16 amps.

Ok thanks, I didn't know if the other flywheels had less magnets or something. I'm probublay just running two much electronics for 16amp extended use.

Efi/vst , large gps/graph , recall tach , bobs trim pump, trim computer, 24v trim

group 24 battery, extended long runs seems to wear it down.

[us1]

I have never been to the lake yet were my batteries didn't badly need charging when I got back. Just the trim and the fuel pump draw way more then 16 amps.