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Old 08-06-2020, 08:37 AM   #101
Ol' Ron
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Default Re: Let's build a drag race 8BA engine

This discussion, has not solved the problem of getting air into the engineMost stock engines of 4.2/5.0 liter engines produce more power than a highly modified fathead. WHY???? they get more air.
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Old 08-06-2020, 08:51 AM   #102
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Default Re: Let's build a drag race 8BA engine

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This discussion, has not solved the problem of getting air into the engineMost stock engines of 4.2/5.0 liter engines produce more power than a highly modified fathead. WHY???? they get more air.
In thinking of this, would a Smith-type "jiggler" head that placed the intake valve over the piston to allow for a higher lift/larger valve in order to get more air into the motor help?
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Old 08-06-2020, 11:00 AM   #103
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Default Re: Let's build a drag race 8BA engine

Arduns work very well.
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Old 08-06-2020, 12:01 PM   #104
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Default Re: Let's build a drag race 8BA engine

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This discussion, has not solved the problem of getting air into the engine. Most stock engines of 4.2/5.0 liter engines produce more power than a highly modified fathead. WHY???? they get more air.
So then, the best way to fill that cylinder, with the port that came with these engines, is to reduce the cubic inch displacement, to get the highest HP per CI.

In a class that has 11 lb per CI, it would make since to reduce the size of the engine or, at least increase it to a minium and get as much compression as possible.

A .030 over 221, 24 stud, would be a 225 with the stock stroke and 217.75 if you offset grind it to 3.625. A 239 would be 243.85 and 235.7 with the 3.625 stroke. With the smaller engines, porting and as much compression as possible, I think you could get 1 HP per CI, or more.

I can't tell you what it might take to get 10/1, or higher C/R on a engine that small but, that means that you can have a car as light as 2398 lb.
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Old 08-06-2020, 12:02 PM   #105
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Default Re: Let's build a drag race 8BA engine

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Arduns work very well.
Haha. Yes they do. My Smith "jiggler" suggestion was in the spirit of keeping it a flathead.

In all my travels, I only saw one pair of Smith Jigglers and it was at Hershey. It was in the late 90's. If only I had a time machine.
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Old 08-06-2020, 12:05 PM   #106
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Default Re: Let's build a drag race 8BA engine

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So then, the best way to fill that cylinder, with the port that came with these engines, is to reduce the cubic inch displacement, to get the highest HP per CI.

In a class that has 11 lb per CI, it would make since to reduce the size of the engine or, at least increase it to a minium and get as much compression as possible.

A .030 over 221, 24 stud, would be a 225 with the stock stroke and 217.75 if you offset grind it to 3.625. A 239 would be 243.85 and 235.7 with the 3.625 stroke. With the smaller engines, porting and as much compression as possible, I think you could get 1 HP per CI, or more.

I can't tell you what it might take to get 10/1, or higher C/R on a engine that small but, that means that you can have a car as light as 2398 lb.
You may be interested to read about Barney Navarro's work with small displacement flatheads. He de-stroked some of his blown engines to fit into different race classes, but I believe he also understood the need to get more air into the motor. Between oxygen injection and blowers, I think Barney was on the right track.
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Old 08-06-2020, 12:19 PM   #107
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Default Re: Let's build a drag race 8BA engine

With all of this talk about getting more air (oxygen) into these engines, I have to wonder why Nitrous Oxide is not more popular.
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Old 08-06-2020, 01:08 PM   #108
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Default Re: Let's build a drag race 8BA engine

Yeah OK, and I bet you have a 307 in a 69 Nova with a Powerglide, 3.23 gears, single 4v, that runs 9's in the quarter, through the mufflers, on street tires, with no power adders !
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Old 08-06-2020, 01:36 PM   #109
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Yeah OK, and I bet you have a 307 in a 69 Nova with a Powerglide, 3.23 gears, single 4v, that runs 9's in the quarter, through the mufflers, on street tires, with no power adders !
How are you talking to? Why are you being so negative?
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Old 08-06-2020, 01:38 PM   #110
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Default Re: Let's build a drag race 8BA engine

I have to keep reminding myself, don't pick on the easy ones.
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Old 08-06-2020, 01:45 PM   #111
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I have to keep reminding myself, don't pick on the easy ones.
Haha. Good advice.
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Old 08-06-2020, 04:03 PM   #112
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Default Re: Let's build a drag race 8BA engine

In jWL book, the first 100 pages discribe the modification of a stock engine, without going into it. He never got a 100 HP from it. but, the original engine ony produced 80 HP. Something to think about.
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Old 08-06-2020, 06:31 PM   #113
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Default Re: Let's build a drag race 8BA engine

would a GMC 371 blower give it more air
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Old 08-06-2020, 06:52 PM   #114
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Default Re: Let's build a drag race 8BA engine

Yes Sir Tom.
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Old 08-06-2020, 07:01 PM   #115
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Default Re: Let's build a drag race 8BA engine

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would a GMC 371 blower give it more air
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Old 08-06-2020, 07:54 PM   #116
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Default Re: Let's build a drag race 8BA engine

Ok, we are talking about building an engine for a specific racing class. All of these ideas that are outside of the class restrictions are not going to help! And 1 hp/ci is not easy to comeby on a NA flathead on gas. We are talking some big bucks.
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Old 08-06-2020, 08:19 PM   #117
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Default Re: Let's build a drag race 8BA engine

Did Ford ever state a reason for the change to domed pistons and chambers, or announce a claimed benefit? I've wondered this since starting to investigate 21 stud engines.
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Old 08-06-2020, 08:53 PM   #118
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Default Re: Let's build a drag race 8BA engine

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would a GMC 371 blower give it more air
Not sure why, but 4-71 seems to work better for the snouts are easier to come by. A 3-71 snout that works for a flathead is like hen's teeth.
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Old 08-06-2020, 09:35 PM   #119
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Default Re: Let's build a drag race 8BA engine

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Not sure why, but 4-71 seems to work better for the snouts are easier to come by. A 3-71 snout that works for a flathead is like hen's teeth.
From the H.A.M.B. > https://www.jalopyjournal.com/forum/...1040241/page-2


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Old 08-07-2020, 01:40 AM   #120
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Default Re: Let's build a drag race 8BA engine

Food for though.....

HP costs money but HP per CI, can cost a lot more. HP per CI, is what wins races in class racing.

Now a days, you can easily build a 304 to as much as a 315 CI FH, using the 4.25 cranks. But, because of the little 1.312 ID intake port, each time you go up, in CI, you gain total HP but, loose HP per CI. Even with a blower, you can't get much threw that port. I would bet a Built, N/A 302 SBF will put out more than a blown FH of the same CI.

You gain some on C/R as you increase CI but, you loose breathing ability. For the street, CI helps and blowers help but, you'll never win a class race that way.

The old saying "speed costs money, how fast do you want to go?" will always apply, especially in class racing.
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