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07-20-2021, 04:35 PM | #1 |
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Join Date: Mar 2014
Location: Salem, Ohio
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Stock top crow foot head, again
The 3rd sample casting proved even better than the first 2, which are in the hands of builders. I made 4 more prototypes and here is the first one of those machined. These are around 7:1 (just a bit over).
Tod |
07-20-2021, 05:01 PM | #2 |
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Re: Stock top crow foot head, again
Very nice looking Heads. Well done. |
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07-20-2021, 09:20 PM | #3 |
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Re: Stock top crow foot head, again
I was wondering how you could have a 7 to1 without a spark plug recess ...
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07-20-2021, 10:33 PM | #4 |
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Re: Stock top crow foot head, again
Underside of my Winfield 7:1, for comparison.
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07-21-2021, 07:21 AM | #5 |
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Re: Stock top crow foot head, again
Very nice work Tod!!
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07-21-2021, 07:22 AM | #6 |
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Re: Stock top crow foot head, again
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07-21-2021, 03:30 PM | #7 |
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Join Date: Mar 2014
Location: Salem, Ohio
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Re: Stock top crow foot head, again
All 4 of the next samples have been machined and they came out nice. I think all 4 of them are already sold, but I will be making a batch for the next buyers as soon as I have at least a dozen to make.
Tod |
07-21-2021, 11:15 PM | #8 |
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Re: Stock top crow foot head, again
This is very interesting, (and cool). I have not seen that shape before but I don't know a lot about the different shapes, just that there are several. Can you explain the advantages of this combustion chamber compared to others? Thanks.
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07-22-2021, 05:08 PM | #9 |
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Location: Norfolk UK
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Re: Stock top crow foot head, again
Liking that Tod.
The stock 14.9hp head has the sparkplug recess like that. |
07-22-2021, 05:45 PM | #10 |
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Location: Salem, Ohio
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Re: Stock top crow foot head, again
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01-05-2022, 12:55 PM | #11 |
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Re: Stock top crow foot head, again
How can I order one of these heads?
( price and estimated delivery date) |
01-05-2022, 01:04 PM | #12 |
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Re: Stock top crow foot head, again
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01-05-2022, 03:23 PM | #13 |
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Re: Stock top crow foot head, again
The squish area, where the piston comes close to the head, is what give a puff of air that creates the turbulence. The more turbulence the better the performance. The trick is to not cut off the flow of air into the cylinder by the head. Plus, the more centralized the spark plug, the faster the air/fuel will burn which helps performance. I would guess that Tod's head and the Winfield have been designed with these things in mind. The flathead Briggs and Stratton heads were a good design.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. Last edited by nkaminar; 01-05-2022 at 03:29 PM. |
01-05-2022, 05:01 PM | #14 |
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Location: Corning NY
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Re: Stock top crow foot head, again
Is the head made from gray iron (class 30/40) or ductile iron (60-40-18, etc.)?? Nice looking casting and machining. Are you planning on leaving the foundry logo on the head as well as HT #?
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01-05-2022, 08:52 PM | #15 |
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Re: Stock top crow foot head, again
Since I am a "Junior Member", I have apparently not earned the right to send personal messages or emails
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01-05-2022, 08:56 PM | #16 |
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Location: Richmond, Indiana
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Re: Stock top crow foot head, again
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01-05-2022, 10:25 PM | #17 |
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Location: Wa.
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Re: Stock top crow foot head, again
They were the ultimate for efficiency which equates to maximum hp and gas mileage.
Maximum available transfer area with minimum depth and ideal plug location for fastest flame front speed to full chamber. |
01-05-2022, 10:43 PM | #18 |
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Join Date: Jan 2013
Location: Mangawhai NZ
Posts: 66
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Re: Stock top crow foot head, again
Hello Tod, yes the Model B 7.1.I received from you last year performs realy well I love it.
Cheers Ross in very warm Mangawhai NZ |
01-06-2022, 08:07 AM | #19 |
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Location: VA
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Re: Stock top crow foot head, again
It would be interesting to compare that to the Harley Davidson racing KR750 flatties, which have a similar reputation.
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01-06-2022, 09:02 AM | #20 |
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Location: Salem, Ohio
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Re: Stock top crow foot head, again
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