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1. Oversize Valve Seats (score: 1): Author: Mike MacLean <macleans@earthlink.net>; Date: Wed, 04 May 2005 13:42:36 -0700; Does someone know where I can get slightly oversize exhaust valves for my BN2? The head I am using came off a 100M car. Somewhere in the past, someone put some oversize exhaust seats in it for whatev; /html/healeys/2005-05/msg00104.html (7,847 bytes)
2. Re: Oversize Valve Seats (score: 1): Author: Dave & Marlene <rusd@velocitus.net>; Date: Wed, 04 May 2005 17:55:54 -0600; Hi Mike, You didn't give any dimensions which makes it a bit hard to know just what oversize you need. Denis Welsh has exhaust valves for the BN2 in 1.562" & in 1.614". I think it is fairly common to; /html/healeys/2005-05/msg00110.html (8,412 bytes)
3. Re: Oversize Valve Seats (score: 1): Author: Mike MacLean <macleans@earthlink.net>; Date: Wed, 04 May 2005 21:10:00 -0700; Maybe some one on the list has the measurements of the head of a six cylinder valve. The measurement of the standard 100-4 valve head is 1.415" - 1.420", or about 36mm. I rough measured the exhaust v; /html/healeys/2005-05/msg00115.html (9,464 bytes)
4. Re: Oversize Valve Seats (score: 1): Author: Mike MacLean <macleans@earthlink.net>; Date: Wed, 04 May 2005 21:30:06 -0700; I don't know about the overall length of a 100-4 valve as opposed to a 6 cylinder valve, but according to original service manuals for both cars, the stem diameter is the same. Mike MacLean 56 BN2 60; /html/healeys/2005-05/msg00116.html (9,037 bytes)
5. Re: Oversize Valve Seats (score: 1): Author: Mike MacLean <macleans@earthlink.net>; Date: Fri, 06 May 2005 06:27:35 -0700; To all that answered my question about what size exhaust valve to use in my 4 cylinder head because of the oversize seats, 3000 valves fit perfectly. Some suggested just that, but I always thought if; /html/healeys/2005-05/msg00147.html (7,764 bytes)
6. Re: Oversize Valve Seats (score: 1): Author: Dave & Marlene <rusd@velocitus.net>; Date: Fri, 06 May 2005 12:19:06 -0600; Hi Mike, It depends on the overall engine design. The in & out need to be somewhat balanced. What can't get out can't get in & vs. Usually the exhaust needs to flow about 70% to 80% of what the intak; /html/healeys/2005-05/msg00150.html (8,124 bytes)
7. Re: Oversize Valve Seats (score: 1): Author: Mike MacLean <macleans@earthlink.net>; Date: Fri, 06 May 2005 13:01:14 -0700; It will be interesting to see how well this engine runs.; /html/healeys/2005-05/msg00151.html (8,566 bytes)
8. Re: Oversize Valve Seats (score: 1): Author: WILLIAM B LAWRENCE <ynotink@msn.com>; Date: Fri, 06 May 2005 17:11:36 -0700; I have to disagree. Larger inlet valves are advantageous because a larger port opening makes filling the cylinder easier considering the fact that you have only the ambient air pressure outside the c; /html/healeys/2005-05/msg00159.html (9,198 bytes)
9. Re: Oversize Valve Seats (score: 1): Author: Dave & Marlene <rusd@velocitus.net>; Date: Fri, 06 May 2005 20:59:09 -0600; If you must disagree - OK. Note that I said exhaust around 70 to 80% & of the intake. Not exhaust the same as intake. I never said that they should be equal. The intake can be so large that velocity; /html/healeys/2005-05/msg00168.html (10,628 bytes)
10. Re: Oversize Valve Seats (score: 1): Author: "Charley Braum" <cbaustin@verizon.net>; Date: Fri, 06 May 2005 23:29:46 -0400; I think larger inlet ports might be due to the fact that more gas, by weight, is entering the chamber under lower absolute pressure, whilst the exhaust ports have to handle less total weight of gas u; /html/healeys/2005-05/msg00169.html (8,300 bytes)
11. Re: Oversize Valve Seats (score: 1): Author: WILLIAM B LAWRENCE <ynotink@msn.com>; Date: Fri, 06 May 2005 22:52:51 -0700; With respect (and agreeing that we are only talking about natural aspiration) I again have to differ. The down stroke of the piston can only act indirectly to induce the air fuel mixture to move by; /html/healeys/2005-05/msg00172.html (9,916 bytes)

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