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12-02-2023, 09:28 PM | #21 |
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Re: Shoud I relieve my block
Here's one of them Ford flathead speed secrets learned some time ago a built not relived Ford flathead will rev to 5 grand. To get another thousand RPM a relief will get you there. And to get even more pay attention to what Dale wrote above.
Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
12-02-2023, 11:31 PM | #22 | |
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Re: Shoud I relieve my block
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In the old days I saw the Bean Bandits engine with the heads off several times. Also several other record setters of the day. The info is out there if people really want to get it. The thing is, most people can not tell what they are looking at even if they have a caliper and can measure things. Modifying a certain area by even .010 can lose you 5 hp. Few people can discern .010 with the naked eye. |
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12-03-2023, 12:09 AM | #23 |
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Re: Shoud I relieve my block
With the Gas allowed at Bvill I can't see that running ON14: 1 CR I know John looked at allot of chambers, His displacement was alittle over 300 not sure what and the Cr around 12 :1 I know what the power was, ans it was nowhere near 1 per cubic inch. Just what kind of gas do you run on 14:1Cr???? Or is that a secret also/???
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12-03-2023, 12:28 AM | #24 |
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Re: Shoud I relieve my block
I don't think that any of my modern engines have run at Bonneville.
They are circle track engines for vintage racing. Most run alcohol but I do know that a couple run 118 race gas because of rules. It works fine. I ran the old discontinued 115/145 av gas in the 50's and it worked fine also. Gas is usually down in hp about 10% from alcohol. |
12-03-2023, 09:18 AM | #25 |
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Re: Shoud I relieve my block
if you want a fast car buy a corvet. the more you do to a flathead the worst it runs if you want a smooth cool running eng leave it stock
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12-03-2023, 09:30 AM | #26 |
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Re: Shoud I relieve my block
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Interesting. I'd hafta guess that the Hudson racing cognoscenti had a few secrets like this as well. |
12-03-2023, 09:34 AM | #27 |
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Re: Shoud I relieve my block
Ron at Bonneville VP racing fuels brand is the gas available.
Anyone running for a gas record must use the VP gas. Example of the octane grades available C-16 has an octane rating of 116 for compression ratios up to 17.1. The actual altitude at Bonneville is just over 4000 feet for a flathead that has a hard time breathing at sea level this of course is a big issue. I've read for every 1000 feet of altitude an engine can see a reduction in power of 15 percent. When other factors are added in the density altitude gets even worse early morning at Bonneville the density altitude is just under 6000 feet. That's why the backup runs for a record at Bonneville are held early morning so our engine's have the the best air possible. Here's one example and some details from the fastest run to date we made with our stock block Ford flathead {Note stock block means we use the three exhaust ports on each side of the block as designed we do not add any other exhaust port} Our flathead is 292 cubes we burn C-16 VP gas the car weight is well over 3000 pounds. The density altitude just after 2 PM in the afternoon was over 7000 feet the Ford flathead engine turning 6100 RPM ran 219.8 MPH . To get a speed this fast burning gasoline takes horsepower lots of it we always run a block relief to help the combination to survive. Hopefully this information will help others in the future who may one day decide to try and do this crazy stuff some of us are doing. Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
12-03-2023, 09:38 AM | #28 | |
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Re: Shoud I relieve my block
Quote:
Ronnieroadster
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I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH |
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12-03-2023, 12:49 PM | #29 |
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Re: Shoud I relieve my block
I don't know, but the Beach Boys seemed to think it made a difference. ;-)
Little Deuce Coupe, you don't know what I've got (You don't know what I've got) Little Deuce Coupe, you don't know what I've got Well, I'm not bragging, babe, so don't put me down (Deuce Coupe) But I've got the fastest set of wheels in town (Deuce Coupe) When something comes up to me, he don't even try (Deuce Coupe) 'Cause if it had a set of wings, man, I know she can fly She's my little Deuce Coupe You don't know what I've got Little Deuce Coupe You don't know what I've got Just a little Deuce Coupe with a flathead mill (Deuce Coupe) But she'll walk a Thunderbird like it's standing still (Deuce Coupe) She's ported and relieved, and she's stroked and bored (Deuce Coupe) She'll do a hundred and forty in the top end floored She's my little Deuce Coupe You don't know what I've got (She's my little Deuce Coupe) (You don't know what I've got) She's got a competition clutch with four on the floor And she purrs like a kitten 'til the lake pipes roar And if that ain't enough to make you flip your lid There's one more thing, I've got the pink slip, Daddy And coming off the line when the light turns green (Deuce Coupe) Well, she blows 'em outta the water like you've never seen (Deuce Coupe) I get pushed out of shape, and it's hard to steer (Deuce Coupe) When I get rubber in all four gears She's my little Deuce Coupe You don't know what I've got (She's my little Deuce Coupe) (You don't know what I've got) She's my little Deuce Coupe You don't know what I've got (She's my little Deuce Coupe) (You don't know what I've got) She's my little Deuce Coupe You don't know what I've got, what I've got
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12-03-2023, 01:22 PM | #30 |
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Re: Shoud I relieve my block
This whole thread was great reading on a cold rainy day......Thanks guys!!.......Mark
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12-03-2023, 02:55 PM | #31 | |
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Re: Shoud I relieve my block
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Dale, Thanks for a very balanced and informative discussion of the topic!. John
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12-03-2023, 03:21 PM | #32 | |
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Re: Shoud I relieve my block
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12-04-2023, 08:33 AM | #33 | |
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Re: Shoud I relieve my block
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Like anything else, there is no one "right" answer . . . the answer is the usual "well, it depends". |
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12-04-2023, 11:26 AM | #34 |
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Re: Shoud I relieve my block
I am not sure exactly how the rating system works on this forum, but if you have enjoyed this discussion I encourage you to rate this thread. The “Rate this thread” button is in the ribbon at the top of the thread. Normally I would rarely rate a thread, but there are special discussions that warrant a rating.
I have thoroughly enjoyed this discussion. Thanks to Ol Ron for kicking off this thread. |
12-04-2023, 01:49 PM | #35 |
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Re: Shoud I relieve my block
Well over 1400 people have looked at it so I guess you can take your pick RR , I appreciate your input, what you've done to improve the flathead in competition is impressive. What I learned from limited stock car racing has allot to do with my building knowledge. Right now I working on a street engine with Good performance, good economy, long life and under 3K$. That might be harder than running at Bivll.
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12-05-2023, 06:01 PM | #36 |
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Re: Shoud I relieve my block
To add to this, I have three 99A's. Two are relieved and one is not. I'd assume the two that are were in trucks. One of the relieved and the non-relieved are both crack in the #3 intake valve seat.
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12-06-2023, 06:20 AM | #37 |
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Re: Shoud I relieve my block
Is this a decent summary of the information in this thread?
1 - Below 4500 rpm there is no benefit to a relief. 2 - For motors built for competition use a relief can help, but must be carefully designed. The rpm range of competition will heavily favor whether a relief is helpful or not. 3 - For all out high rpm use such as land speed racing a relief is necessary. |
12-06-2023, 10:09 AM | #38 | |
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Re: Shoud I relieve my block
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Thanks all for contributing to this thread. Last edited by Tim Ayers; 12-06-2023 at 12:57 PM. |
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12-06-2023, 03:22 PM | #39 |
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Re: Shoud I relieve my block
Truck and industrial engines which see high load over extended periods of time will often have lower compression ratios. One way of doing this is to relieve the block. GM did this on the 348-409 Chevrolet truck and industrial engines. I'd suspect Ford did the same.
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12-06-2023, 04:17 PM | #40 | |
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Re: Shoud I relieve my block
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Wrong. 2 - "For motors built for competition use a relief can help, but must be carefully designed. You will be in the "C" main without it and there is no design to it. You just go bigger. "The rpm range of competition will heavily favor whether a relief is helpful or not". It helps over the whole rpm range. 3 - "For all out high rpm use such as land speed racing a relief is necessary." Right. |
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