05-27-2010, 03:26 PM
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Registered User
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Join Date: Mar 2007
Location: DELAWARE
Posts: 1,041
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Quote:
Originally Posted by BAD300
Have located an M103 engine from a Sydney warehouse (Next state here in Aus). $950. Have asked the compression readings. think I'll give him a ring alter today & talk turkey. He also has an M104 for $1500. if this is a newer engine with lower klms & I know they have oil squirters in the block. This may be the better deal? Not sure about engine mount location etc? Anyone know if these blocks are same same?
Are the M104 engines a better choice? Considering it is to be turbocharged?
Also pulled the forged pistons fro the original engine. Only travelled 3-4k & look standard bore size
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If you intend to turbocharge the better choice would be the M103-12V.
The M103-12V has a CR about 1 point lower then the M104-24V.
The lower CR lends to adding boost with less chance of detonation.
My opinion ( from experience ) is that the M103 is more bullet proof when boosted then the M104-24V.
The M103-12V power can be doubled from stock if set up properly at 7lbs boost.
I dyno ( Mustang load dyno ) at 262RWP and 302 torque.
Baseline pulls were 135RWP and 145 torque.
Published at the flywheel is 177HP and 188 torque.
So extrapolating I'm about 344HP and 392 torque at the flywheel at 7lbs boost.
The M104-24V was saddled with a bit more emission control parts which just aren't necessary if you're adding boost.
I prefer the CIS-E over the HFM and the M103 intake configuration over the plastic M104 runners.
However you decide make sure you do not only a compression test, but also a leak down test.
Don't necessarily look at the net psi readings on the compression test, but more the variance between cylinders.
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