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| Blueprint EA |
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I am rebuilind the bottom end on my new mtoro shortly.
3.9Ltr MPFi I am going to bore it out 60 thou. Does anyone know if you can get a crank out of any motor that by putting it in would give it a bigger stroke. e.g. i think with 202's you can put in a ford crank and the stroke is increased aka more HP 
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| Waggin |
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Blueprint EA wrote: I am rebuilind the bottom end on my new mtoro shortly.
3.9Ltr MPFi I am going to bore it out 60 thou. Does anyone know if you can get a crank out of any motor that by putting it in would give it a bigger stroke. e.g. i think with 202's you can put in a ford crank and the stroke is increased aka more HP The stroke of these engines is already ridiculously long, and physically can't be made any longer. Already begged several workshops to do a custom crank for me.. its a no go!
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| EBXR8380 |
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Exactly....Actually the 3.3 makes a VERY good strong engine when turbo'd..With good valve gear etc, they rev to the moon...
A slightly shorter stroke would help the 4.0 also...By offset grinding the big end bearings..Capacity would be reduced though....
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| mspw |
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EBXR8380 wrote: Exactly....Actually the 3.3 makes a VERY good strong engine when turbo'd..With good valve gear etc, they rev to the moon...
A slightly shorter stroke would help the 4.0 also...By offset grinding the big end bearings..Capacity would be reduced though.... I think you make a very good point here. The 3.3 in a Multi-point / Turbo setup would appear at least on paper to have some unexplored potential IMO.
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| John_xr6 |
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dont think you can go up 0.060" on a 3.9/4.0L. the most is 0.040".
i would want to keep it at most 0.020" as the bigger you go the more it can run too hot. i know that you can run AU rods and pistons in any 3.9/4.0L as the big end journal size on the cranks are all the same.
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| bowsaw |
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mspw wrote: EBXR8380 wrote: Exactly....Actually the 3.3 makes a VERY good strong engine when turbo'd..With good valve gear etc, they rev to the moon... A slightly shorter stroke would help the 4.0 also...By offset grinding the big end bearings..Capacity would be reduced though.... I think you make a very good point here. The 3.3 in a Multi-point / Turbo setup would appear at least on paper to have some unexplored potential IMO. |
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| Waggin |
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John_xr6 wrote: dont think you can go up 0.060" on a 3.9/4.0L. the most is 0.040".
i would want to keep it at most 0.020" as the bigger you go the more it can run too hot. i know that you can run AU rods and pistons in any 3.9/4.0L as the big end journal size on the cranks are all the same. .060 is fine, and doesnt run too hot.. not even at 11.7:1 compression 
The only thing that got hot last night on the dyno was the extractors.. basically see-thru red
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| Blueprint EA |
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hey waggin do you have forged pistons'/ how much they cost?
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| Waggin |
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Blueprint EA wrote: hey waggin do you have forged pistons'/ how much they cost?
Yes, I do. Call around for prices on ACL forged.
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