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10-06-2017, 09:33 PM | #21 |
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Re: Cylinder wall thickness
No, I haven't had a chance to use a flow bench for years. I know I spent several months boyh times,It was hard to stop. I did discover one thing, The bowl is the biggest problem. Also, all it take is 15 -20 minutes per port to get a major increas in flow, any more time is not very productive.. The only way to increase the flow is to replace the port , and eliminate the bowl.
I do my best work while in bed. |
10-07-2017, 06:01 AM | #22 |
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Re: Cylinder wall thickness
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10-07-2017, 06:31 AM | #23 | |
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Re: Cylinder wall thickness
Quote:
https://www.jalopyjournal.com/forum/...hauser.365658/ |
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10-07-2017, 06:58 AM | #24 |
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Re: Cylinder wall thickness
WOW! That's disappointing. It seems these days, it's all about the money.
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10-09-2017, 12:27 PM | #25 | |
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Re: Cylinder wall thickness
Quote:
If I provide a flow bench and tools I will let you come to my place and test all you want! I have the plans to build one with a shop vac and the plate to convert that to cfm. |
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10-09-2017, 01:37 PM | #26 |
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Re: Cylinder wall thickness
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10-10-2017, 02:38 PM | #27 | |
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Re: Cylinder wall thickness
Quote:
btw, my understanding was that flatheads need more flow at low lift and the bigger valves help that?? here is part of the article. http://www.musclecardiy.com/cylinder...-heads-part-3/ |
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10-10-2017, 06:37 PM | #28 |
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Re: Cylinder wall thickness
How do you calibrate the holes???
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10-10-2017, 07:06 PM | #29 |
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Re: Cylinder wall thickness
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10-11-2017, 07:47 AM | #30 |
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Re: Cylinder wall thickness
Ron, can you let us know what you do in the ports in your 15-20 minutes work please?
Many thanks, Martin. |
10-11-2017, 08:02 AM | #31 |
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Re: Cylinder wall thickness
Hi Ron , yeah please let us know what to do.
Michael |
10-11-2017, 08:54 AM | #32 |
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Re: Cylinder wall thickness
OK, I'm having trouble with my computer so, posting a picture is difficult. Using a micrometer, measure the thickness of the top of the port. You do this by placing the mike through the water jacket on top of thee port. depending on the year of the block. this will be around .300". Now using a die grinder with a carbide cutter. reduce this to aprox. .100" across the area of the valve opening. Using a junk block. drill some holes in the area where the port enters the bowl. All of the material you remove is from the top of the port. Using the 1.6 chevy valve, this should give a 10/15 % in flow.
Now, a short story. When my friend Richard was building his engine, he asked me about this porting "stuff" |
10-11-2017, 09:07 AM | #33 |
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Re: Cylinder wall thickness
I told him all this and sent him a fer pics. After awhile he said he'd rather not do this and wondered what affect it would have on performance? I had no idea becuse I always did this. He decided not to do this. I told him to get a set of chevy exhaust valves, becuse he was using an L-100 cam. Afew years later I went down to Fla and drove the car. Now this is no light weight, however the T-5 trqns and 4.10 read gave fantastic acceloration. The OD gave exelent fuel economy. I think his 276 was one of the best running engines I ever drove, considering the fact that it was a simple build. Merc crank Egge pistons, L-100 cam and Edelbrock heads intake and carb. I think the key component was his ignition system and tuning . I was impressed. So for street I don't really tink porting is worth the effort,
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10-11-2017, 09:57 AM | #34 | |
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Re: Cylinder wall thickness
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10-11-2017, 06:25 PM | #35 |
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Re: Cylinder wall thickness
mtt
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10-12-2017, 02:29 AM | #36 |
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Re: Cylinder wall thickness
Thanks for the explanation Ron,
Good information right there. So what were shooting for is as straight a shot as we can at the valve? A 10-15% increase in flow is quite substantial. Many thanks Martin. Last edited by scooder; 10-12-2017 at 02:39 AM. |
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