New 400 Piston, Need Feed-back
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Laughing Gas
Joined: Nov 2002
Posts: 1,198
Likes: 9
From: Fairmont
New 400 Piston, Need Feed-back
I am considering another piston, basically to replace the badger. Because of production turn around, the Badgers are very hard to supply. So I am considering another custom, but in the $150 range.
Options:
1) Flat top, 9.5:1 W/76cc heads. .080" deck height, 1.640" Comp Height (just like the badger)
2) Small dish, 9.5:1 W/76cc heads. "Zero" deck height, 1.720" Comp Height
3) ????? What do you think?
I am liking #2
Options:
1) Flat top, 9.5:1 W/76cc heads. .080" deck height, 1.640" Comp Height (just like the badger)
2) Small dish, 9.5:1 W/76cc heads. "Zero" deck height, 1.720" Comp Height
3) ????? What do you think?
I am liking #2
Posting Guru
Joined: Jun 2002
Posts: 1,099
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Depends which closed chamber you're talking about. A 63cc (351C 4V), I get 10.8, 60cc (Edelbrocks, AFD, etc) is 11.2, and with 58cc (302C) I got almost 11.5:1.
If you can cut the dish a little deeper to create custom ratios it sounds like a better option for aluminum heads. Otherwise I think you're looking at around 9.3:1 with the other pistons.
If you can cut the dish a little deeper to create custom ratios it sounds like a better option for aluminum heads. Otherwise I think you're looking at around 9.3:1 with the other pistons.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
A zero deck hyper piston with a disk with enuf meat to vary the dish would be nice. I have no interest in aluminum heads but something to use with closed chamber iron heads would be good to get 9.5:1.
Remember one of the reasons the FT badgers were about 0.010 shorter than stock 71 pistons was a machining allowance for decking the block and heads.
Remember one of the reasons the FT badgers were about 0.010 shorter than stock 71 pistons was a machining allowance for decking the block and heads.
Posting Legend
Joined: Sep 2001
Posts: 30,255
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Senior User
Joined: Mar 2000
Posts: 448
Likes: 1
From: Chimacum/Jefferson County
# 2 looks good. I agree with danlee, .080 below deck really bites. Cast would be good but hyper's would be better! 
TMI, why not Hyper? What would be the cost difference? 
TMI, why not Hyper? What would be the cost difference?
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Thread Starter
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Laughing Gas
Joined: Nov 2002
Posts: 1,198
Likes: 9
From: Fairmont
We already have a hyper for the Aussie heads. They cost $295 a set.
About %90 of the pistons we sell are the cast Badger. I don't forsee a large amount of those wanting to spend twice the money. That's why I am looking for an ecnomical alternative.
Now I can possible see the next piston being a 1.720" hyper that will give 9.5:1 with the stock head.
But I have to slow down, I have about $15,000 of pistons on the shelf.
About %90 of the pistons we sell are the cast Badger. I don't forsee a large amount of those wanting to spend twice the money. That's why I am looking for an ecnomical alternative.
Now I can possible see the next piston being a 1.720" hyper that will give 9.5:1 with the stock head.
But I have to slow down, I have about $15,000 of pistons on the shelf.
Thread Starter
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Laughing Gas
Joined: Nov 2002
Posts: 1,198
Likes: 9
From: Fairmont
New development
How's this sound?
This is based off of a "claimer" hyper. piston.
1.710" comp height, press fit .975" pin, small dish(12cc) to give 9.5:1 with 76cc heads, and hyper. piston.
Maybe about $175 a set.
This is almost exact like the Hyper Badger (in idea) we started with, but it has the dish already in it.
The claimer series has less machining done to them, otherwise same material.
Deal or No Deal??
This is based off of a "claimer" hyper. piston.
1.710" comp height, press fit .975" pin, small dish(12cc) to give 9.5:1 with 76cc heads, and hyper. piston.
Maybe about $175 a set.
This is almost exact like the Hyper Badger (in idea) we started with, but it has the dish already in it.
The claimer series has less machining done to them, otherwise same material.
Deal or No Deal??
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
I think that piston works well for stock open chamber heads on gasoline, and for closed chamber heads on E85.
I think that Bill Beyer once posted a link to a graph of Octane rating vs dynamic compression ratio. If I could find that graph, I could determine the maximum DCR for E85, and the static compression ratio to achieve this with a moderate cam.
I think that Bill Beyer once posted a link to a graph of Octane rating vs dynamic compression ratio. If I could find that graph, I could determine the maximum DCR for E85, and the static compression ratio to achieve this with a moderate cam.
Senior User
Joined: Dec 2004
Posts: 282
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From: Langley B.C.
would this be something to work with the stock 400 heads. something better than the current available pistons to go with stock heads would be awesome. upates on this subject??? want to start my build soon.
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Laughing Gas
Joined: Nov 2002
Posts: 1,198
Likes: 9
From: Fairmont
Yes this piston will work with the stock 400 heads. Friday KB Pistons contacted me and is finished withthe drawings, they will be sent to me and I just have to sign off on them. Then it will be a typical 4-6 weeks.