The Ford Barn

Ol' Ron · 10-06-2017, 09:33 PM

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.

tubman · 10-07-2017, 06:01 AM

Quote:

Originally Posted by rich b

Pretty sure Speedway has licensed the Offenhauser name for use on some of their own products.

How do you know this? I would think that if something like this had happened we would have heard about it.

rich b · 10-07-2017, 06:31 AM

Quote:

Originally Posted by tubman

How do you know this? I would think that if something like this had happened we would have heard about it.

dmarv's post (5th) provided that info.

https://www.jalopyjournal.com/forum/...hauser.365658/

tubman · 10-07-2017, 06:58 AM

WOW! That's disappointing. It seems these days, it's all about the money.

revkev6 · 10-09-2017, 12:27 PM

Quote:

Originally Posted by Ol' Ron

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.

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.

Ol' Ron · 10-09-2017, 01:37 PM

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That's interesting. I built my first one about 25 years ago. the results are in my book. Converting to CFM is tricky, and un necessary. The best method is to measure the difference in change. Or improvement in flow. You'll find that allot of stock removal in some places, don't help much and oversize valves don't increase flow as much as the trouble installing them. All this port mods help only at high RPM"s, where a street engine never runs much. But a race engine, that's a different story.

revkev6 · 10-10-2017, 02:38 PM

Quote:

Originally Posted by Ol' Ron

That's interesting. I built my first one about 25 years ago. the results are in my book. Converting to CFM is tricky, and un necessary. The best method is to measure the difference in change. Or improvement in flow. You'll find that allot of stock removal in some places, don't help much and oversize valves don't increase flow as much as the trouble installing them. All this port mods help only at high RPM"s, where a street engine never runs much. But a race engine, that's a different story.

actually converting to CFM is pretty easy. guy came up with a plate that has 3 or 4 holes in it. each hole is made to flow a certain cfm and calibrate against. chart your flow in excel against the calibration and you get flow you can compare against others. kinda neat I thought.

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/

Ol' Ron · 10-10-2017, 06:37 PM

How do you calibrate the holes???

revkev6 · 10-10-2017, 07:06 PM

Quote:

Originally Posted by Ol' Ron

How do you calibrate the holes???

The article gives all the instructions. It's pretty simple

scooder · 10-11-2017, 07:47 AM

Ron, can you let us know what you do in the ports in your 15-20 minutes work please?
Many thanks,
Martin.

HotRodmicky · 10-11-2017, 08:02 AM

Hi Ron , yeah please let us know what to do.
Michael

Ol' Ron · 10-11-2017, 08:54 AM

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"

Ol' Ron · 10-11-2017, 09:07 AM

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,

revkev6 · 10-11-2017, 09:57 AM

Quote:

Originally Posted by Ol' Ron

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,

what about in something smaller cube?? .040 over 8ba?? I'm going to start a thread about it. i just picked up a never fired "stock rebuild"

Ol' Ron · 10-11-2017, 06:25 PM

mtt

scooder · 10-12-2017, 02:29 AM

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.

10-06-2017, 09:33 PM	#21
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	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, 06:58 AM	#24
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,320	Re: Cylinder wall thickness WOW! That's disappointing. It seems these days, it's all about the money.

10-09-2017, 01:37 PM	#26
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Cylinder wall thickness Sponsored Links (Register now to hide all advertisements) That's interesting. I built my first one about 25 years ago. the results are in my book. Converting to CFM is tricky, and un necessary. The best method is to measure the difference in change. Or improvement in flow. You'll find that allot of stock removal in some places, don't help much and oversize valves don't increase flow as much as the trouble installing them. All this port mods help only at high RPM"s, where a street engine never runs much. But a race engine, that's a different story.

10-10-2017, 06:37 PM	#28
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Cylinder wall thickness How do you calibrate the holes???

10-11-2017, 07:47 AM	#30
scooder Senior Member Join Date: Jul 2010 Posts: 2,593	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
HotRodmicky Senior Member Join Date: May 2010 Location: Germany Posts: 249	Re: Cylinder wall thickness Hi Ron , yeah please let us know what to do. Michael

10-11-2017, 08:54 AM	#32
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	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
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	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,

10-11-2017, 06:25 PM	#35
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Cylinder wall thickness mtt

10-12-2017, 02:29 AM	#36
scooder Senior Member Join Date: Jul 2010 Posts: 2,593	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.