Race car update
Discussion
The engine is kaput, not bad for 35,000 miles and 20 odd races but I was hoping for a bit more from it, lol
My engine did have failed bearings as suspected but not the usual cause, this time the lack of oil pressure was due to large cracks appearing from the main crank bearing housings or whatever they are called (journals?) up through the block, then the crank starting to move around.
One theory at this point is vibration being the cause but even then, my shift light is set at 6500rpm so its not a dizzy height of revs, the new mountune M15 engine was sent to a engine balancing workshop who found the bottom end with the lightened underdrive pulley and flywheel fitted to be out of balance, which could have caused bad frequencies through the block/crank.
So, advised to go back to standard pulley with the damper and the bottom end was then balanced up, its all built up now and going back in the car, fresh clutch release/slave and the gearbox was stripped and rebuilt by gearbox manny.
Looking forward to getting back on track but I'm just hopeful that it was the imbalance that caused the failure rather than power levels as this year I've only been running 500bhp 520lbft and plenty others run the same or more, granted not for anywhere near the same length of time or constantly flat out.
Will try get some pics of the block soon
G
My engine did have failed bearings as suspected but not the usual cause, this time the lack of oil pressure was due to large cracks appearing from the main crank bearing housings or whatever they are called (journals?) up through the block, then the crank starting to move around.
One theory at this point is vibration being the cause but even then, my shift light is set at 6500rpm so its not a dizzy height of revs, the new mountune M15 engine was sent to a engine balancing workshop who found the bottom end with the lightened underdrive pulley and flywheel fitted to be out of balance, which could have caused bad frequencies through the block/crank.
So, advised to go back to standard pulley with the damper and the bottom end was then balanced up, its all built up now and going back in the car, fresh clutch release/slave and the gearbox was stripped and rebuilt by gearbox manny.
Looking forward to getting back on track but I'm just hopeful that it was the imbalance that caused the failure rather than power levels as this year I've only been running 500bhp 520lbft and plenty others run the same or more, granted not for anywhere near the same length of time or constantly flat out.
Will try get some pics of the block soon
G
Hi Graham, I had my Mountune block crack in exactly the same way & agree problem is probably associated with balance. My current engine was fully balanced including the alloy pulley & flywheel, running higher revs & power than yours with no issues - so far !
As you say though 35k on a race engine is not bad & you can't really complain, IMO of course
As you say though 35k on a race engine is not bad & you can't really complain, IMO of course
Makes mine look pathetic the more i look at this the more this looks like a right bodge
if oils sprays are needed they should be drilled into the oilway at a much smaller diameter this will keep the strength in the metal
if a jet has to be fitted then the jet should be counterbored and the oil drilling slightly bigger than the jet size
I am pretty sure some older fords used a spray bar that taps into the block somewhere else - might be worth investigating if somebody else is going to build an engine
do all nobles have the oilways drilled at this diameter ?
if oils sprays are needed they should be drilled into the oilway at a much smaller diameter this will keep the strength in the metal
if a jet has to be fitted then the jet should be counterbored and the oil drilling slightly bigger than the jet size
I am pretty sure some older fords used a spray bar that taps into the block somewhere else - might be worth investigating if somebody else is going to build an engine
do all nobles have the oilways drilled at this diameter ?
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