02-13-2016, 05:48 PM | #1 |
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winfield head
I have a rebuilt motor with pistons that come 0.20 over the top deck and a best gasket with a 0.42 compressed thickness will this work with a Winfield head with no relief cut over the pistons the rods will stretch at high rpm .
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02-13-2016, 07:25 PM | #2 |
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Re: winfield head
No you need 0.040- 0.050" clearance to be safe some get by with less but that is a risk
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02-13-2016, 08:16 PM | #3 |
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Re: winfield head
Certainly I wasn't prepared to take the risk in exactly the same situation and had the head machined using a computer program to provide clearance over the pistons
Keith |
02-13-2016, 08:17 PM | #4 |
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Re: winfield head
tommy it wont work as colin said. I am doing this now same thing with red head .had .035 clearance could only advance 4 deg then pre ing. go ing to cut my head tom. for .050 clearance and try that also centrificul adv dist worked better than manuel advance I have fsi ign round off all sharp edges in comb .chambers
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02-13-2016, 09:39 PM | #5 |
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Re: winfield head
Cut down the piston tops.
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02-13-2016, 09:45 PM | #6 |
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Re: winfield head
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02-13-2016, 10:08 PM | #7 |
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Re: winfield head
I had the same problem with a Thomas Head. I had the head machined to provide clearance, same a "wensum" said.
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02-13-2016, 11:19 PM | #8 |
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Re: winfield head
Have you ever seen a Model A that would REV high enough to "stretch" the rods??---Sounds like one for "MYTH BUSTERS"!
Bill W.
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02-14-2016, 01:57 PM | #9 |
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Re: winfield head
yes I have I have a 2 port riley that I have had to 5500 repeatly
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02-14-2016, 04:40 PM | #10 |
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Re: winfield head
the head I have is aluminum so I took the head gasket and a scribe marked over pistons then took a sharpie then got my router and a carbide tip bit and removed the material and with a 90 degree die grinder polished with good results checking with feeler gauge and straight edge.
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02-14-2016, 09:25 PM | #11 |
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Re: winfield head
Outstanding. A man who wants to do something will find a way; a man who doesn't will find an excuse.
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02-15-2016, 01:34 AM | #12 | |
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Re: winfield head
Quote:
Good on you ! Having an alum super Winfield and having been in the exact same situation, I took PC/SR suggested action, i.e.- cut the piston tops off ....with a HAND SANDER ! Came out perfect and I use her (Russian B) hard ! Had to do same same with newly made B, but since was putting it all together from scratch, had machinist mill tops off of pistons. Self action is/was the American when more time than money,eh ! |
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02-16-2016, 11:29 AM | #13 |
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Re: winfield head
Do the rods really "stretch" that much and still return to their original length, or is it the crankshaft flexing at high RM? I vote for crankshaft flex.
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02-16-2016, 08:28 PM | #14 |
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Re: winfield head
pistons stretch with heat iron stretches when heated don't know at what rate but I needs clearance regardless.
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02-17-2016, 09:29 AM | #15 |
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Re: winfield head
I had a Model B cylinder head cut to raise the compression ratio by eliminating the reliefs in the head for the pistons plus some more material.
Using clay on the piston tops, I determined the overall clearance (including piston protrusion above the block deck and the gasket thickness) was 0.010". I ran the motor at a car speeds of 65 to 75 mph with stock differential gears, and initially the pistons did not come into contact with the cylinder head. However, once carbon built-up on the piston tops, there came a horrible knocking sound as the clearance between the head and pistons went to zero. That ended my experiment with a shaved cylinder head. The right way is to run a cylinder head with combustion chamber shapes designed for high compression. Reliefs in the head for piston clearance are a necessity.
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02-17-2016, 10:45 AM | #16 |
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Re: winfield head
My Winfield crows foot aluminum head is still working fine with no relief cut into the head. I have a standard gasket, then a 0.031" copper spacer gasket and then another standard gasket. This was recommended by a shop that builds hi-performance and racing engines. The Ross pistons came up quite a way above the deck.
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02-17-2016, 11:08 PM | #17 |
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Re: winfield head
where did you get the spacer gasket I also have a Winfield red head that I will be putting on a motor that I plan to build in the future
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02-18-2016, 01:06 AM | #18 |
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Re: winfield head
Innovative machine & supply makes head gasket shims.
http://innomach.com/ |
02-18-2016, 09:53 AM | #19 |
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Re: winfield head
tommy rand:
I bought my copper spacer from: Clark Copper Head Gasket 10510 Nassau Street Blaine, MN 55449 (763) 786-9590 I bought 2 pieces so I would have a spare. Thickness is .031" and is for .100" overbore. The part number for mine is PN030505-A Cost me $65 each in 2011 Good Luck Dick
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02-18-2016, 03:02 PM | #20 | |
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Re: winfield head
Quote:
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