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mike armstrong
United Kingdom
63 Posts |
 Posted - 15/02/2008 : 22:32:32
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Has anyone put a J2 head on an M-type block and put it in an M-type?
Apart from the change in position of the water outlet in the radiator header tank and the exhaust manifold /carbs on opposite sides - is this conversion feasible and more-importantly - worthwhile from performance point of view?
Mike Armstrong
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mike armstrong
United Kingdom
63 Posts |
Posted - 21/02/2008 : 14:42:47
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In the absence,so far,of a respose tot his query - as an alternative - does anyone have, or know of, a J2 engined M-Type?
Thanks in anticipation. Mike |
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kimber
United Kingdom
1529 Posts |
Posted - 21/02/2008 : 15:11:54
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You will need to increase the stud size to 3/8" and from memory there is some slight difference in the water passages, but I don't think that matters. Otherwise, short answer is yes, you can. My brother had a J2 with an M-type/Minor block. Maybe this will prompt a fuller response elsewhere.
Re. performance increase: - Standard J head + twin carbs will definitely out-perform standard M-type set-up in the same car, but with a decent cam, manifold and carb and a bit (a lot) off the flywheel, an M-type head will give good surprisingly good performance in an M chassis.
If you do it, bear in mind the J2 had a bigger oil pump and a stronger clutch.
Oh, and you'll need a decent crank/rods... |
Edited by - kimber on 21/02/2008 15:19:55 |
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rbm
United Kingdom
141 Posts |
Posted - 25/02/2008 : 12:19:59
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chassis shouldn't be a problem there is at least one MM chassis with a blown riley engine in it, might have to do something with the brakes!
Richard |
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David Allison
United Kingdom
665 Posts |
Posted - 25/02/2008 : 14:08:30
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Mike
The modification is quite simple - larger head studs etc..
The larger oil pump is a good idea and you might consider a J sump and I would think the radiator might need enlarging.
I would also move the fuel tank and fit an electric fuel pump - the standard tank and gravity feed are neither the safest or most suitable option with more horses!
My personal feeling is - dont go there!
The chassis an brakes of the M are just not up to the increase in power and torque.
M types are given to overturning more easily than most other MMM cars ( the underslung axles and floating shackle springs dont help), the high centre of gravity and top heavyness count against the car.
Tuned M types are more prone to tip over just by the fact of more power means more speed.
I had experience of Dave Carsons M type with a C type engine and that was too fast for its chassis!
Sorry to be less than positive - and it is only my opinion.
Dad always taught me that cars only go as fast as you prod the right hand pedal - but even he is of the opinion that the last thing an M type needs is more power.
Regards David |
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mike armstrong
United Kingdom
63 Posts |
Posted - 28/02/2008 : 00:08:27
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Thank you to all the respondents. I think I'll save the J2 head for a J2 and put the M-type bits where they belong.
Mike |
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