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Location:
Sydney
Registered:
April 2003
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4AGE / 20V bolt pattern differences
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Tue, 08 April 2003 01:47
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Im putting a new engine in my offroad buggy to replace the datsun motor currently in there. The eventual plan is to go to 20V with Motec when the money is available. The immediate plan is to go with a 4AG and stock computer. Upgrade to motec, then to 20V.
Question is: are the bolt patterns for 4AGE and 20V the same? are bolt patterns for the cranks the same? Bolt patterns for exhaust? That way I can use the 4AGE as a spare and not waste money on new extractors, adaptor plate etc when I move to the 20V.
Anything else I should know about the differences? Engine mounts? oil pickups? sump depths? any info appreciated.
Rivmasta
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Club Member
Location:
sydney
Registered:
May 2002
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Re: 4AGE / 20V bolt pattern differences
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Tue, 08 April 2003 06:20
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Well it all depends on which 4AGE youre going to use, the smallport and bigport heads have different exhaust stud patterns, and the gudgeon pins are different sizes, otherwise almost everything else is swappable.
If youre into buggies then youll probhably allready know who Jason Graham is, he would be a good start for someone to talk to regarding setup, as his early buggies had 4AG variants.
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Location:
Sydney
Registered:
April 2003
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Re: 4AGE / 20V bolt pattern differences
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Tue, 08 April 2003 07:02
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Ha ha! Funnily enough I was talking to bob grahame to source the 4AG. Im actually heading to his workshop tonight to pick up some other bits and peices and check the progress of his desert truck.
do you know of any pages or sites that list the differences between the 4AG variants?
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Location:
Adelaide
Registered:
May 2002
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Re: 4AGE / 20V bolt pattern differences
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Tue, 08 April 2003 07:18
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Try Bill Sherwoods site http://www.billzilla.org and have a search through the forums. 90% of your questions should be answered then 
Happy Hunting!
Craig.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: 4AGE / 20V bolt pattern differences
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Tue, 08 April 2003 13:44
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The big/small port exhaust side is the same, and the inlet manifold bolt pattern is identical, just the port sizing is different. How do I know this? I tried to bolt my small port manifold to my big port head and it took me several minutes to work out why the bloody thing wouldn't start 
The 20V uses a slightly different exhaust pattern, and the inlet side is completely different. Engine mounts, flywheel bolts, etc. are much the same though, just the water hoses and dizzy position changes.
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Location:
Sydney
Registered:
April 2003
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Re: 4AGE / 20V bolt pattern differences
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Wed, 09 April 2003 05:00
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Cheers mate,
Ill be looking to save myself some money when we switch from 4AG to 20V. is it just the bolt pattern for the exhaust that is different? If so Ill try to drill the plate for both heads. Or are the ports different size, shapes, positions?
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Location:
sydney
Registered:
March 2003
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Re: 4AGE / 20V bolt pattern differences
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Wed, 09 April 2003 07:38
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use the 20v extractors that come when u buy a 20v
they are much nicer
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Club Member
Location:
sydney
Registered:
May 2002
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Re: 4AGE / 20V bolt pattern differences
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Wed, 09 April 2003 07:54
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How did Bob/Jasons truck look?? last time I saw it he hadnt finished adapting the roll cage for the new motor??
In the buggy youre probhably better off using the FWD setup as mentioned previously..I have a 20V exhaust header here you can have for $50 if need be.
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Location:
Sydney
Registered:
April 2003
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Re: 4AGE / 20V bolt pattern differences
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Wed, 09 April 2003 23:53
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Cheers guys, but I wont be able to use the standard extractors. The engine in the buggy is in the back so the standard ones face the wrong direction, and the muffler will sit at the same height as the rocker to give better ground clearance. so - itll be made to suit.
I'm planning on going 10mm larger diameter pipe, tuned length, 4 into 1 going into a 3 inch pipe with a straight through muffler. The overall linear length will be about 2 meters from head to tip. Can anyone pick any faults with this setup? Im a bit concerned there may not be enough back pressure. Im not after massive revability, rather it needs to pull strong in mid range so Im really after torque.
I do want to get away with using the same extractors on both the 4AG and the 20v - Ill be spending the weekend in workshops with an old exhaust gasket comparing between small and large port heads and the 20v to make sure.
As for Bob and Jasons truck - its definately coming along. Engine (nissan V6), gearbox, diff all mounted, suspension being finalised, panels have all been modified to suit. Its definately going to be one serious unit. Mind you, I know another guy who is currently building the same chassis truck but 6 inches wider track with a VERY serious full house 351+ clevland shoehorned into it, TH700 and a Dana 60 (12 inch?) diff. Its a work of art!
Mind you, he had all this running gear in a F150 last year and our 4 cyl still beat his arse at every race!!! ha ha!
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