#70044 - 05/31/12 06:51 PM
Re: Good article about quench.
[Re: Mean buzzen half dozen A.K.A. Hank]
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DeuceCoupe
Active BB Member
Registered: 04/17/06
Posts: 288
Loc: Northern CA
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A very good article, but everything I've seen Vizard write is very good. The numbers are pretty consistent with the dyno stuff I've seen and my own DeuceCoupe Gonkulator computer that tries to capture it in simulation.
It's not like you gain 50hp just from a little more quench as is sometimes implied, but there is some gain, and mostly the quench and swirl then allows you to run more compression which gains even more. The sets of numbers tell that story.
Thanks for the link! 
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#70603 - 06/30/12 09:08 PM
Re: Good article about quench.
[Re: panic]
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Vman
Active BB Member
Registered: 10/13/08
Posts: 46
Loc: CA
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Does anybody know what the maximum is that one can mill off a 250 Deck? I got new pistons and they are down in the hole .057
Seems like all the new ones are like that. the old ones were only .032 in the hole. I want to zero deck it so I am thinking of taking off .057 off the deck of the block. Any opinions? I will be using the engine for just stock daily driver. But at this point it would have .098 squish with current block.
Any one know where to get thinner head gaskets than .041
Edited by Vman (06/30/12 09:09 PM)
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#70604 - 06/30/12 09:57 PM
Re: Good article about quench.
[Re: Vman]
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Mean buzzen half dozen A.K.A. Hank
Active BB Member
Registered: 09/23/04
Posts: 4550
Loc: Ca
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Is there anyway you can install 307 SBC pistons?
307 pistons will be closer to the deck.
IIRC, Felpro HG are .038 compressed.
I believe I have some NOS HG that are thinner than .038 more like .035 ish?
Silver in color.
They are round bore, no valve relief notches, I forgot the brand name.
I think I bought them from Clifford years ago?
With .098" that is not considered any quench & could actually cause the engine to detonate from being down the hole so much.
With the low deck blocks being weak in the driver side fwd head bolt area & tends to crack with a stock thickess block, shaving it .057" will make it more weaker.
If it is a stock engine, you could shave the block, run a head stud in that corner & run less final torque, you could probably get away with it, but it's up to you.
I would get the correct height pistons, or even pistons that come out of the block some & shave the pistons down before shaving the block that much.
If they are available, the factory steel shim gaskets are .020"ish?
I might be thinking of the older 194 6 cyl head gaskets.
Anyone? 
MBHD
_________________________
12 port SDS EFI 
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#70612 - 07/01/12 09:39 PM
Re: Good article about quench.
[Re: tlowe #1716]
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Vman
Active BB Member
Registered: 10/13/08
Posts: 46
Loc: CA
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OK great thanks for the tips and I'm drooling over those nice flat pistons. But I am going to go with the suggestion of getting some that stick out. So I got some 230 flat top pistons.
they have a compression height of 1.779 I think I can shave enough off of them and have enough thickness left and go with a thicker gasket possibly. I was thinking of shaving them only in the squish areas and leave the rest to stick up into the combustion chamber maybe with a ramp if necessary to increase compression. maybe then it will be too much compression. I will be having all sorts of combustion enhancing devices on the engine. HHO, Singh groove on head, plasma ignition, and some water injection of some kind, and ammonia, so I am not too worried about detonation with the high compression. I am looking to build a high mileage car, not so much for performance. Using many of the techniques from Eagle research books on improving mileage. I am currently treating all the engine parts except cylinder walls, with tungsten disulfide to reduce friction. It involves polishing and then embedding the tungsten disulfide into the metal to create a low friciton coating. Some companies out (microblue)there doing it for bearings and engine parts. I thought I would do it on my own as a budget art project LOL doing things outside the normal. I can post some photos later if anyone is interested.
Edited by Vman (07/01/12 09:44 PM)
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#70695 - 07/15/12 04:44 AM
Re: Good article about quench.
[Re: Vman]
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70Nova
Active BB Member
Registered: 05/06/11
Posts: 113
Loc: Va
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If you need to shave the pistons and if you end up doing it with a milling machine, now would be a good opportunity to mill a dish on them that mirrors the combustion chamber in shape. If your numbers would otherwise allow for it, like if you need more CC after zero decking them. For reasons explained in this topic. Just thinking out loud...
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#70836 - 07/25/12 03:00 PM
Re: Good article about quench.
[Re: 70Nova]
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Vman
Active BB Member
Registered: 10/13/08
Posts: 46
Loc: CA
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OK I got the 307 Pistons in here today. looking to go with them. Now a question came up with the pin offset. seems like there is considerable ofset to the piston pin. which side do I put the offset to???? The narrow side towards the manifolds?? So I need to put two in backwards since they are for a V8?
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#70839 - 07/25/12 09:29 PM
Re: Good article about quench.
[Re: Vman]
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Vman
Active BB Member
Registered: 10/13/08
Posts: 46
Loc: CA
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Never mind I think I answerd the question on my own. thanks.
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