Hi all. I posted about this problem a few months ago but didn't realise what was happening at the time.
Basically built a high revving 1310 engine. it was very difficult to start unless you retarded the timing to start it and then re advanced it to drive it.
I tried replacing the dizzy for this one
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Which helped on the power front but not with starting.
It munched 2 starter motors,
Then I bought this starter motor thinking it would help. It did not...
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The engine spec is:-
1310
286 cam
1:5 rockers
ported head
twin 1.5" su's
9.5:1 compression ratio
KAD flywheel
Pre engaged starter setup
It stopped starting due to not having any ring gear left.
I took the engine out, checked the cam timing which is spot on 106 degrees ATDC
the static ignition timing is 5 degrees BTDC.
I put a standard SPI flywheel on, kept the clutch cover off so I could view the starter teeth engaging. It starts and runs well (out of the car)
I then bought a second hand KAD flywheel off ebay. The ring gear was immaculate.
I then fitted that flywheel, and again it is having big problems starting. If you look at the starter teeth while it is cranking, metal shavings are coming off the flywheel because the solenoid is pulling and pushing the starter gear through the flywheel teeth.
It appears that the momentum of the heavier flywheel is the only difference, possibly damping each cylinder as its firing?
My questions are. How many of you use lightweight flywheels with lumpy cams? Is this a known problem? and is there a way around it?
I imagine all of the race spec minis use similar arrangements, so how do they work?
I am getting quite disillusioned with the car because I spent ££££ on this engine and a few hundred trying to sort this problem out and I am not a rich person!
Sorry for the rant. I honestly thought the problem was sorted so this is kind of disappointing.
Any help or advice would be greatly appreciated!
Cheers
Regards
James