2 pump gas combos

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Post  460bronco on January 13th 2013, 2:31 pm

What would be the pro's vs. con's of these two basic combos?

1. 466 with flat top piston, zero decked, and D3 heads

2. 466 with 22cc dish at stock deck height and DOVE heads

I believe with the correct cam choice, either of these would be pump gas friendly. Assume all other parts are the same and each head flows 310/190.

Would there be any basic advantages for one over the other?

Thanks,
Jon
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Post  bbf-falcon on January 13th 2013, 8:34 pm

Is this engine for street use OR Competition?

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Post  460bronco on January 14th 2013, 4:20 pm

Sorry about that... Mainly street use and some 4x4 competitions. New rule for stock iron is pumpgas as well, so, I'm looking to detune the combo a little. Running the zero decked flat-top with DOVE combo right now.
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Post  IDT-572 on January 14th 2013, 6:40 pm

A zero deck D3 head -3cc flat top single valve relief piston will have the same compression as a zero deck Dove head with a 19cc dish top, about 10.1 :1 comp. So I would just do what ever cost the least.


Now see if this smells better................ Rolling Eyes


Last edited by IDT-572 on January 14th 2013, 11:29 pm; edited 1 time in total (Reason for editing : Brain and hand not on the same page.............)
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Post  Mustang-junky on January 14th 2013, 9:15 pm

IDT-572 wrote:A zero deck D3 head 19cc dish piston will have the same compression as a zero deck Dove head with a 3 cc flat top, about 10.1 :1 comp. So I would just do what ever cost the least.

Don't get this. Bigger chamber head and a dished piston will have the same compression as a flat top with smaller chambers? Did you mean a 19cc DOME?

Jess
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Post  DanH on January 14th 2013, 9:24 pm

Mustang-junky wrote:
IDT-572 wrote:A zero deck D3 head 19cc dish piston will have the same compression as a zero deck Dove head with a 3 cc flat top, about 10.1 :1 comp. So I would just do what ever cost the least.

Don't get this. Bigger chamber head and a dished piston will have the same compression as a flat top with smaller chambers? Did you mean a 19cc DOME?

Jess

think the pencil wrote the wrong specs under each head

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Post  richter69 on January 14th 2013, 9:38 pm

lol me too
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Post  738drvr on January 14th 2013, 9:48 pm

Snake, please edit. Quick. Shocked
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Post  IDT-572 on January 14th 2013, 11:26 pm

Long day guys............ you figured it out Embarassed
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Post  IDT-572 on January 14th 2013, 11:32 pm

Mustang-junky wrote:
IDT-572 wrote:A zero deck D3 head 19cc dish piston will have the same compression as a zero deck Dove head with a 3 cc flat top, about 10.1 :1 comp. So I would just do what ever cost the least.

Don't get this. Bigger chamber head and a dished piston will have the same compression as a flat top with smaller chambers? Did you mean a 19cc DOME?

Jess


Jess,

I was just checking to see if you were paying attention.............. Cool
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Post  466cj on January 14th 2013, 11:35 pm

Guess only real advantages to the D3VE is it uses a 14mm spark plug and more cores out there, other than that like Blake said which ever is cheaper given what you have already.

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Post  460bronco on January 15th 2013, 2:38 pm

I guess what I was getting at was: Is there an advantage to run the flat top or the dish from an efficiency stand point?

Thanks,
Jon
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Post  466cj on January 16th 2013, 4:24 pm

All else being equal don't think it will much matter. Ign. curve and total timing may be slightly different, but that is about it. If I was looking to possibly upgrade to another head in the future that would be a consideration. Seems to be more "good" heads in the 72 - 75cc range.

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