I think you missed the point of my previous message... This crank/piston/block combo truly may not be capable of turning more than 3500 RPM no matter what head you bolt to it. It will vibrate like a semi truck and scatter its internals all over the place at RPM above there...
I agree that if a tranny does not bolt up, then you are really paving a hard path...TR
h25 motor?
Moderators: notoptoy, S Allen, Solex68
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67 1/2 1600
h25 info...
Here are some pics of the perfomance curve
Last edited by 67 1/2 1600 on Sun Dec 05, 2004 9:26 pm, edited 1 time in total.
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67 1/2 1600
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ambradley
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Here's the best picture I could find of an H-series engine, decked out for forklift use:
I'm no expert, but I wonder about the bore and stroke of this engine vs. large eight cylinder engines. How does it compare in terms of cylinder bore, stroke, piston weight, and are those crankshafts counterbalanced?
It becomes a moot point if the cost of buying and prepping the engine exceeds the cost of installing something modern and more powerful, but it's interesting to think about.
I'm no expert, but I wonder about the bore and stroke of this engine vs. large eight cylinder engines. How does it compare in terms of cylinder bore, stroke, piston weight, and are those crankshafts counterbalanced?
It becomes a moot point if the cost of buying and prepping the engine exceeds the cost of installing something modern and more powerful, but it's interesting to think about.
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Daryl Smith
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H25 Motor?
The engine dimensions seem to be the same as the H20. So.....
If the bearings are the same, and the bore spacing is the same, there is a good CHANCE that the H25 crankshaft would bolt into the R16.
If so this would give you about 2300 cc's. (2260-2270 approx.) I think this would work well with a "worked" R16 head up to the 6000 or so rpm mark.
Issues then become "Is the crank balanced/strong enough?"
"What rod/piston do I use?"
"Will the crank rotate in the block without hitting
anything?"
Since you would obviously not be able to use the H25 piston (too big), a special order (or match bore, pin size, and pin height from another engine) would be in order. U20, H20 or even R16 rods could be used.
Strong enough? Probably.
Balancing? Most likely could be worked.
Clearance? Someone is going to have to stick their neck out and try it.
IF IT WILL WORK, then for the price of the crankshaft and a set of special order pistons you could have a torquey little R16 lookalike.
just my $0.02
Daryl
If the bearings are the same, and the bore spacing is the same, there is a good CHANCE that the H25 crankshaft would bolt into the R16.
If so this would give you about 2300 cc's. (2260-2270 approx.) I think this would work well with a "worked" R16 head up to the 6000 or so rpm mark.
Issues then become "Is the crank balanced/strong enough?"
"What rod/piston do I use?"
"Will the crank rotate in the block without hitting
anything?"
Since you would obviously not be able to use the H25 piston (too big), a special order (or match bore, pin size, and pin height from another engine) would be in order. U20, H20 or even R16 rods could be used.
Strong enough? Probably.
Balancing? Most likely could be worked.
Clearance? Someone is going to have to stick their neck out and try it.
IF IT WILL WORK, then for the price of the crankshaft and a set of special order pistons you could have a torquey little R16 lookalike.
just my $0.02
Daryl