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08-21-2011, 06:31 PM | #1 |
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Flathead block dimensions
Can someone help me out? My computer crashed and I lost a bunch of information!!! I used to have a mechanical drawing of the front of a flathead engine that had all the internal dimensions on it and such, does any one have some good pictures like this?
Specifically I'm in need of the dimension from cam c/l to crank c/l??? Any help MUCH MUCH appreciated |
08-21-2011, 07:57 PM | #2 |
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Re: Flathead block dimensions
Send a pm or an email to JWL. Maybe he can help you out. I believe I read a post on here some time ago where he was talking about FH dimensions on a blueprint that he has.
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08-21-2011, 10:14 PM | #3 |
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Re: Flathead block dimensions
Here is a link to a discussion on another forum on the subject:
http://flatheadv8.org/phpBB/viewtopi...3&hilit=offset |
08-22-2011, 08:30 AM | #4 |
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Re: Flathead block dimensions
Thanks for the help guys.....I'm gonna message JWL
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08-22-2011, 11:45 AM | #5 |
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Re: Flathead block dimensions
The front cross sections are from the backs of the dyno sheets in about '38-48 Service Bulletins.
Blown49 prints and sells posters based on these, very clear enhanced ones. I belive he can supply the pre and post 1945 versions showing the different valve angles. |
08-22-2011, 01:22 PM | #6 | |
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Re: Flathead block dimensions
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Quote:
Thanks, Gary in N.Y. P.S. I have 3 blocks here at the moment, 1 early and 2 late, and all are in that area! |
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08-23-2011, 06:57 AM | #7 |
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Re: Flathead block dimensions
Well, once again, "Gofast" has contributed bad information. Please do not machine your blocks to the dimensions submitted.
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08-23-2011, 07:13 AM | #8 | |
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Re: Flathead block dimensions
Quote:
It's not my goal to pass along "bad" info! Thanks, Gary in N.Y. P.S. That measurement was taken from one early block here! |
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08-23-2011, 02:37 PM | #9 |
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Re: Flathead block dimensions
The cam CL is offset from the crank CL. It is possible to measure the chordal distance, apparently as has been reported, but that does describe the actual location. The vertical dimension, perpendicular to the pan rail, from crank CL to the cam CL is 4.6875 +-.001 Then, the horizontal distance over to the cam CL is .0212 +-.002
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08-23-2011, 05:04 PM | #10 |
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Re: Flathead block dimensions
Hi JW, like I stated, I try my best to keep the info "on the level" here.
The C/C that I gave him is correct, given the fact that the C/L's themselves may be different does not change the actual C/C distance! Those "different" C/L's are incorporated into the final C/C number! This is how I see it. It may change the "locations" but if someone like Cloyes happens to be making the timing sets they need the "true" C/C. The best comparison I can give you would be on a 4 or 6 cyl Chev (see the photo below). It more or less exaggerates what you are saying if I understand your point. The crank gear is a "few inches" over from the cam gear, but this doesn't change the C/C?? It does change the location of the timing marks with respect to both gears, but not the C/C. I know I don't need to explain the following to you, but some here may see it better with some "fixed" numbers: One of the blocks I took the dimensions from reads as follows: main bore=2.672" cam bore=1.929" block distance=2.389" (The actual C/C using these numbers is 4.6895") From these these dimensions come the C/C. All the dimensions on that specific block are really above the "high" limits (tolerances), but these are the numbers! (The other 2 blocks here have better main and cam hole sizes) Thanks, Gary in N.Y. P.S. I understand about the C/L's, but that wasn't asked and I wouldn't answer that question without actually "probing" the block in the "CNC". All "offsets"/"dimensions" would show up immediately. |
08-23-2011, 06:59 PM | #11 |
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Re: Flathead block dimensions
I used an online calculator with the numbers offered and come up with some differences. If I use 4.6875 for the vertical and .0212 for the offset, the angled C - C leg is only slightly longer at 4.68754 +.
If I use 4.6875 for the vertical and 4.6895 for the angled, the offset calculates at .1369. Did I mess up somewhere, or is there an error in some of those numbers? |
08-24-2011, 03:30 AM | #12 |
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Re: Flathead block dimensions
Yes, Bill, the hypotenuse dimension(or the center to center of the bores) is about .0004 longer than the vertical dimension of the right angle.
Last edited by JWL; 08-24-2011 at 03:32 AM. Reason: spell check |
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