08-06-2020, 08:37 AM | #101 |
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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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08-06-2020, 08:51 AM | #102 |
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Re: Let's build a drag race 8BA engine
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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08-06-2020, 11:00 AM | #103 |
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Re: Let's build a drag race 8BA engine
Arduns work very well.
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08-06-2020, 12:01 PM | #104 | |
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Re: Let's build a drag race 8BA engine
Quote:
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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08-06-2020, 12:02 PM | #105 |
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Re: Let's build a drag race 8BA engine
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08-06-2020, 12:05 PM | #106 | |
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Re: Let's build a drag race 8BA engine
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Quote:
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08-06-2020, 12:19 PM | #107 |
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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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08-06-2020, 01:08 PM | #108 |
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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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08-06-2020, 01:36 PM | #109 |
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Re: Let's build a drag race 8BA engine
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08-06-2020, 01:38 PM | #110 |
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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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08-06-2020, 01:45 PM | #111 |
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Re: Let's build a drag race 8BA engine
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08-06-2020, 04:03 PM | #112 |
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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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08-06-2020, 06:31 PM | #113 |
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Re: Let's build a drag race 8BA engine
would a GMC 371 blower give it more air
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08-06-2020, 06:52 PM | #114 |
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Re: Let's build a drag race 8BA engine
Yes Sir Tom.
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08-06-2020, 07:01 PM | #115 |
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Re: Let's build a drag race 8BA engine
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08-06-2020, 07:54 PM | #116 |
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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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08-06-2020, 08:19 PM | #117 |
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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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08-06-2020, 08:53 PM | #118 |
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Re: Let's build a drag race 8BA engine
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08-06-2020, 09:35 PM | #119 | |
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Re: Let's build a drag race 8BA engine
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The only thing nice about being imperfect is the joy it brings to others.... "Silver rings, your butt! Them's washers!" "We shot our way out of that town for a dollar's worth of steel holes!" - from 'The Wild Bunch' - 1969 https://www.youtube.com/watch?v=7NReUd2_0u0 |
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08-07-2020, 01:40 AM | #120 |
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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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