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Bottom End Rebuild. 

 

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 Post subject: Bottom End Rebuild.
Posted: Thu Apr 14, 2005 8:08 am 
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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 :D

 

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 Post subject: Re: Bottom End Rebuild.
Posted: Thu Apr 14, 2005 9:42 am 
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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 :D


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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Posted: Thu Apr 14, 2005 11:17 am 
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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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Posted: Thu Apr 14, 2005 1:40 pm 
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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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Posted: Thu Apr 14, 2005 3:10 pm 
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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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Posted: Thu Apr 14, 2005 3:40 pm 
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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.
the 215 cube donk the used to be in Valiants, was good for hi-po mods, due to it being a square bore, as Waggin said, stroke is alredy to long, vibrations/harshness would increase to i reckon.
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Posted: Thu Apr 14, 2005 3:42 pm 
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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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Posted: Fri Apr 15, 2005 10:03 am 
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hey waggin do you have forged pistons'/ how much they cost?

 

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Posted: Fri Apr 15, 2005 1:40 pm 
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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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