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post #1 of 22 (permalink) Old 01-06-07, 11:27 PM Thread Starter
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confused Best 6-Cylinder crank?

Hi Guys,

What is the best 6-Cylinder crank to use? I have heard either the EF series 12-counter weight crank or the EL / AU 9-counter weight.

Anyone got any ideas oe experience with either of these combos? I am thinking of using one in a 4.1 Crossflow.



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post #2 of 22 (permalink) Old 01-07-07, 02:37 AM
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Re: Best 6-Cylinder crank?

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Originally Posted by 5150
Hi Guys,

What is the best 6-Cylinder crank to use? I have heard either the EF series 12-counter weight crank or the EL / AU 9-counter weight.

Anyone got any ideas oe experience with either of these combos? I am thinking of using one in a 4.1 Crossflow.



Cheers
How do you know the e series crank fits the older blocks ?
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post #3 of 22 (permalink) Old 01-07-07, 02:44 AM Thread Starter
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Re: Best 6-Cylinder crank?

There have been some speedway guys doing it.

Plus have done some maths from the dimensions listed in the manuals.

Cheers
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post #4 of 22 (permalink) Old 01-08-07, 12:20 AM
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Re: Best 6-Cylinder crank?

i have read that you should use a 86 or 87da block ( i asume it's an xd/xf block) 200 rods and fitted an ef/el crank and topped with an e2 head (don't know model car it's from )

what i don't understand is isn't the el/ef crank from an overhead cam engine if so how will it drive the cam in the 86 or 87da block?

can some one explain this please???
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post #5 of 22 (permalink) Old 01-08-07, 03:42 AM
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Re: Best 6-Cylinder crank?

well the way i sort have look at is if it has a sprocket for a chain whats stopping it driving a push rod camshaft rather than a over head cam shaft its not like the ratio's could be diffrent they have to be the same!
more to the point of the newer crank using a diffrent rear main and front main seal???????
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post #6 of 22 (permalink) Old 01-09-07, 02:16 AM Thread Starter
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Re: Best 6-Cylinder crank?

Seals? I didnt pick up on those as being different!

Could it just be a machining exercise to match them up?

What are the dimensions? Does any one know?

I need to find some dimensions for the BA Con-rods too.


Cheers
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post #7 of 22 (permalink) Old 01-09-07, 02:56 AM
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Re: Best 6-Cylinder crank?

apparently the rear seal is different and the crank needs machining to fix it
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post #8 of 22 (permalink) Old 01-09-07, 03:04 AM Thread Starter
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Re: Best 6-Cylinder crank?

.. well that does'nt sound too bad .....

Why the EL cranks rather than the EF 12 counter weight ones?


Cheers
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post #9 of 22 (permalink) Old 01-09-07, 03:37 AM
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Re: Best 6-Cylinder crank?

sorry i thought they where the same ( i was wrong ) it's the ef one to use apparently.
we currently have a pair of 250's both with flat tops but one has the 200 rods (which are longer and changed the rod ratio) and the difference between to 2 is noticeable. so in the new one we'll use 200 rods.
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post #10 of 22 (permalink) Old 01-09-07, 11:24 AM
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Re: Best 6-Cylinder crank?

from my expierence with holden 6's
the early motors have 9 thro cranks and the later ones have 12 thro cranks and the problem with the nine thro cranks is they are a un even counter weight because there is 9 counter weights and 6 conrods!
the 12 thro have alot better harmonics!
some people like the 9 thro cranks because they ar lighter so that they rev harder but this is not true because you engine wont rev if it has bad harmonics!!
12 thro is alot smother on the high rpms and stronger due to the harmonics and less vibrations!
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