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02-17-2012, 10:04 PM | #1 |
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Location: Gilbertsville KY
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SNYDER'S High compression heads
Has anyone done a comparison of the 5.5 to 1 and the 6.1 to 1 Snyder's high compression heads . I have installed three 5.5 's for other people and they ran strong. They all had reground touring cams and .060 or less over bore otherwise stock newly rebuilt . I installed a 6.1 in my car , newly rebuilt engine which has the following modifications , .100 overbore , new stipe 330 cam, B carb. , bored out intake , oversize SS valves . My car runs strong but not really any stronger than the cars with the 5.5 . My question , is the 6.1 really any better than a 5.5 or mayby not as good a choise ? Looking at the compression chamber the 6.1 looks more like the stock head , while the 5.5 has a heart shaped chamber . Any experiance or opinions ? Bubby Sharp in KY
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02-17-2012, 10:30 PM | #2 |
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Re: SNYDER'S High compression heads
Here they are for your comparison. 5.5 on the left 6.1 on the right.
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02-17-2012, 10:51 PM | #3 |
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Re: SNYDER'S High compression heads
Thank's for posting Milton , now people can see what I was describing as to shape . Now what I need to know is Which preforms the best? I am speculating that due to the difference in chamber shape maybe the 5.5 may be as good as the 6.1 Bubby Sharp in KY
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02-17-2012, 11:14 PM | #4 |
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Re: SNYDER'S High compression heads
Would be very interested to know the difference, i ordered the 5.5 from Rich Falluca for my new engine, he has been waiting a year for the 6 and hoping to get them in, He said they are a better head??? What that means i dont know
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02-18-2012, 12:48 AM | #5 |
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Re: SNYDER'S High compression heads
http://modelaparts.net/dynosheets.htm/dynosheets.html
I checked Piranios site above and found a stock A dyno run vs. the same engine with a Snyder head. The difference was about 10hp. Still looking for a 6.1 head test. |
02-18-2012, 01:05 AM | #6 |
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Re: SNYDER'S High compression heads
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Joe |
02-18-2012, 01:22 AM | #7 | |
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Re: SNYDER'S High compression heads
Quote:
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02-18-2012, 05:33 AM | #8 |
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Re: SNYDER'S High compression heads
Thanks MikeK, That is what I was looking for. I am glad my friends cars run good also . After looking at some of the tests on Pirano's site I am tempted to put the downdraft manifold I have on my car! Bubby Sharp in KY PS does anyone on this site not have insomina ?
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02-18-2012, 05:55 AM | #9 |
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Re: SNYDER'S High compression heads
"PS does anyone on this site not have insomina ?"
I'm not sure...........I'll have to sleep on it! |
02-18-2012, 08:02 AM | #10 |
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Re: SNYDER'S High compression heads
I am currently running a Snyder 6.1 head in my S/W. Had a Snyder 5.5 in it and had some extra cash one day so upgraded to the 6.1 for the extra HP that it might bring. I could not/can not tell the difference. This was not a scientific experiment, just seat of the pants experience.
Engine specs are Rich Faluca (sp) insert rods. 20/20 crandshaft counterbalanced. Babbit mains. .040 cyl bore. Reground cam to "B" spces. Oversize valves (modern guides). Downdraft Weber carb and manifold. Cast Iron Snyders exhaust header. Aries muffler. ken |
02-18-2012, 01:15 PM | #11 |
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Re: SNYDER'S High compression heads
According to the Dyno report you should see about a whopping 2.8 horsepower increase. For me, not worth the money and time to upgrade from the 5.5 head....
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02-18-2012, 02:04 PM | #12 |
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Re: SNYDER'S High compression heads
Bobby, I would suggest that with all of your modifications, the limiting factor now is the carb. The B carb (or any carb) will only flow a certain amount, regardless of the cam, big valves, etc.
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02-18-2012, 02:08 PM | #13 | |
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Re: SNYDER'S High compression heads
Quote:
Jim B's. comment above this one is well worth re-reading!! . |
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02-18-2012, 08:09 PM | #14 |
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Re: SNYDER'S High compression heads
I purchased a Snyder 6:1 head to put on an engine I built last winter. I decided to go one further. I machined 0.040 of the head. I think that will get me up to 6.5:1 comp ratio.
I haven't fired the engine yet but hope to this spring. Currently rebuilding the rear axle. The rest of the mods. Full oil filtering, pressure to all mains, insert mains, Stipe 340 cam, Larger intake valves, 283 pistons, downdraft intake with 94 carb. Why? Because I can. I love to work on engines. Cal |
02-18-2012, 09:34 PM | #15 |
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Re: SNYDER'S High compression heads
When you read those DYNO results, you can see that the carburator makes more difference then the head. 8 HP more when changing to the Weber carb. Jim B. is 100% correct that the carb is the limiting factor.
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02-19-2012, 11:49 PM | #16 |
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Re: SNYDER'S High compression heads
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02-20-2012, 01:18 AM | #17 |
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Re: SNYDER'S High compression heads
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02-20-2012, 08:18 AM | #18 |
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Re: SNYDER'S High compression heads
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02-20-2012, 09:26 AM | #19 |
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Re: SNYDER'S High compression heads
Anybody has dyno sheets whit single carburator like Stromberg 97 or Holley 94?
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02-20-2012, 10:48 AM | #20 |
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Re: SNYDER'S High compression heads
In this configuration of head and cam what difference does or would dual Tillys make, or are they worth the bother.
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02-20-2012, 10:58 AM | #21 |
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Re: SNYDER'S High compression heads
Dennis Piranio tested A and B duals ... Tilly's would be close to A as size is similar. About 10 HP with duals ...
Here are dyno pulls that he did: http://www.modelaparts.net/dynosheets.htm/vortex.html Main site is here: http://www.modelaparts.net/ |
02-20-2012, 05:11 PM | #22 |
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Re: SNYDER'S High compression heads
I posted this chart a while ago. I got the data off of Piranio's website:
And it sure makes dual updrafts + any HC head look real good. |
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02-20-2012, 11:44 PM | #23 |
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Re: SNYDER'S High compression heads
Thankyou,I'll add that to my list of things to do.
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