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03-12-2024, 10:42 AM | #1 |
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New Eddie Myers’s heads question
Has any body check there squish with these heads ? 59 ab , bored .030 Ross pistons , merc 4 in crank , and I have .085 squish with no head gasket , best head gasket measures .056 , seems way to much clearance to me , don’t I need like .040 total ? That would mean I need to take like .080 off heads ?? Will those heads be able to take that much off ?
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03-12-2024, 10:58 AM | #2 | |
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Re: New Eddie Myers’s heads question
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03-12-2024, 01:11 PM | #3 |
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Re: New Eddie Myers’s heads question
John
Question the pistons are forged Ross standard bore plus and additional .030 ? Ronnieroadster
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03-12-2024, 02:08 PM | #4 |
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Re: New Eddie Myers’s heads question
Squish: For a street engine you'll want .040 to .045 squish (with head-gasket one).
Are you sure you have the right pistons for the crankshaft compression height? How about posting a picture of the block/deck with a piston at TDC and also a picture of the chambers on the heads. You definitely don't want to have that amount of clearance over the pistons - so let's figure out what is wrong before you do anything. Also, how did you measure the squish? |
03-12-2024, 05:48 PM | #5 |
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Re: New Eddie Myers’s heads question
What you really need to know is how far down in the cylinder the outside edge of the piston is at tdc. If that's very far down you'll never get the quench (squish) correct. A few thous. above the deck is better.
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03-12-2024, 07:08 PM | #6 |
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Re: New Eddie Myers’s heads question
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03-12-2024, 07:47 PM | #7 |
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Re: New Eddie Myers’s heads question
I remember back in the 1960s when a guy saw a pair of aluminum heads that he liked he bought them. Then he went to the parts store to get a set of head gaskets. Probably bought what the parts guy told him was best. He installed the heads without any knowledge of "squish". He was so proud of his cool looking engine. The engine ran well and he was happy. Is this scenario not possible anymore for the average guy? Do we all need to measure squish for an old stocker engine to run good enough for weekend drives?
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03-12-2024, 09:24 PM | #8 | |
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Re: New Eddie Myers’s heads question
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Ronnieroadster
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03-13-2024, 10:11 AM | #9 |
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Re: New Eddie Myers’s heads question
I'm a bit of a perfectionist . . . can't help myself! LOL
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03-13-2024, 11:39 AM | #10 | |
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Re: New Eddie Myers’s heads question
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But then again, I'm a real fan of optimum quench. |
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03-13-2024, 12:29 PM | #11 | |
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Re: New Eddie Myers’s heads question
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03-13-2024, 12:37 PM | #12 | |
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Re: New Eddie Myers’s heads question
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There were a lot of things I didn't know back then, either. Last edited by tubman; 03-13-2024 at 12:55 PM. |
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03-13-2024, 02:07 PM | #13 | |
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Re: New Eddie Myers’s heads question
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To answer your question its simple I would do what's needed to get the clearances where I like things. However as I wrote checking for clearance is what most guys do to determine things clear and nothing more. If there's clearance then the heads are just bolted. Here's a couple of questions for you Tubman. That 276 inch flathead engine you wrote about which you were never satisfied with the power it produced did you change the cam in that engine to something other than stock? If the answer is yes did you check the cam timing? Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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03-13-2024, 03:00 PM | #14 |
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Re: New Eddie Myers’s heads question
I found many years ago that sometimes what you think is right just isn't. In my book is a chapter on checking compression, It's pretty much the same old measure the size of the stroke, add alittle something for the head gasket and combustion chamber volume (had to make a fixture for that) and your there?? Or are you?? I found there are too many variables. Now I just put the piston down about 1/4" slap on an old head gasket any pore in some colored windshield wiper fluid from a 20cc beaker and measure the amt. Then do the arithmetic. Makes a big difference, usually lower than you thought. Don't forget to raise the piston.
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03-13-2024, 07:42 PM | #15 | |
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Re: New Eddie Myers’s heads question
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What I don't understand is how this has changed from a legitimate discussion of head preparation to a discussion of cam timing. I did not check the cam timing or the squish in the heads; my bad. I have to assume that the cam was correctly ground and installed by a reputable builder. You can't second guess everything. Let's remember the question posed by the O/P and not get side tracked by what may or may not have happened thirty years ago. |
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03-13-2024, 09:28 PM | #16 |
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Re: New Eddie Myers’s heads question
They are new orosco heads , I did get some pics but not smart enough to know how to post them , can some help here
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03-13-2024, 11:47 PM | #17 |
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Re: New Eddie Myers’s heads question
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These are all of John's pics that I could get to post. Coop https://apis.mail.yahoo.com/ws/v3/ma...ilNorrinLaunch |
03-14-2024, 07:04 AM | #18 |
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Re: New Eddie Myers’s heads question
Best I can measure is piston on edge of cylinder is .025 below the deck , thanks coopman for posting
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03-14-2024, 08:16 AM | #19 | |
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Re: New Eddie Myers’s heads question
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If that measurement is at TDC, I will defer to the experts like Ronnie, Pete, Ol' Ron and Bored & Stroke. From the little I understand, milling the heads won't solve that. This is a piston issue. |
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03-14-2024, 10:06 AM | #20 |
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Re: New Eddie Myers’s heads question
I noticed my post said 20cc beaker it should be a 200 cc one or measure thr chamber and use a 20cc beaker.
I think??? Gramps |
03-14-2024, 10:49 AM | #21 |
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Re: New Eddie Myers’s heads question
Hmmmm . . . I would next accurately measure the crankshaft stroke.
Something seems weird in that you're running a very "normal" setup --> with a 4.00" Merc crank. I would also measure exactly how high the top of the dome of the piston is above the deck. The heads look about "normal" in the dome areas. Would also like to know the depth of the dome/pocket in the center of the head. Measure a piston on both sides of the block. Once we know the stroke and the height of the piston dome, then we can figure out what to do next. If the piston locations (to the deck) are consistent on both sides, then maybe the pistons are for a 4 1/8" stroke compression height. This would result in the piston being .0625 further down than it should be. If the piston was .0625 higher, then things would be a lot closer to how they should be (squish). The piston definitely should not be "down in the hole" as it is. Also, while the engine will run - I would surely want the piston/squish situation to be "fixed" if it was mine. It will be a "dog" as it is currently configured. Companies make mistakes - maybe the pistons were manufactured or boxed incorrectly? |
03-14-2024, 11:13 AM | #22 | |
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Re: New Eddie Myers’s heads question
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03-14-2024, 11:27 AM | #23 |
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Re: New Eddie Myers’s heads question
Yeah Tim - that is my guess as well.
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03-14-2024, 01:02 PM | #24 |
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Re: New Eddie Myers’s heads question
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More of John's pics that he sent this morning. Coop |
03-14-2024, 01:15 PM | #25 |
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Re: New Eddie Myers’s heads question
That piston position looks fine to me. Something is amiss here. Are you sure you measured correctly?
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03-14-2024, 01:35 PM | #26 |
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Re: New Eddie Myers’s heads question
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03-14-2024, 01:43 PM | #27 |
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Re: New Eddie Myers’s heads question
Piston looks fine no issues there from the picture. Would be nice to see the thickness of the putty when its cut in the center and then measured with the vernier. The Orosco heads may be domed at a radius different than the Ross pistons. Older cast pistons such as Jahns as an example were definitely a different dome radius than today forgings.
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03-14-2024, 02:33 PM | #28 | |
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Re: New Eddie Myers’s heads question
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03-14-2024, 04:52 PM | #29 |
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Re: New Eddie Myers’s heads question
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03-14-2024, 05:24 PM | #30 | |
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Re: New Eddie Myers’s heads question
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Your right Tim its certainly a factory relieved block.
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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