Weiand-style head.

[alexiskai]

Originally Posted by updraught

This was on ebay, a hot rod mag from the early fifties. It is to do with early V8 heads, but deals with raising the compression. Just for interest ...
https://i.ebayimg.com/images/g/-6EAA...nj/s-l1600.jpg

Nice to see someone just putting clear numbers out there.

[Synchro909]

IMO, Larger inlet valves are not needed in Terry's new engine. Being new, the valve seats have not had a chance to recede into the block so gas flow is better than an old block there. The inlet tract has also been improved (the change cannot be seen from outside) which again, improves gas flow.
I had everything ready to go with larger inlets but changed my mind. I was not looking for a racing engine, rather something with more stamina for towing. Flexibility is important so I backed off on the valves. I run a 6:1 cast iron head, Webber carburettor, a modified B grind on the cam. (0.308" lift) and an original distributor. To limit the advance (to 22°), I made a bracket which I screwed to the side of the distributor. It has a screw in it that stops the top plate at 22° like an idle stop on the carburettor with no sponginess like I would expect from putting a clamp on the lever quadrant. I rune the lever in one of two positions - "town" and "country". ie, part advance or full advance. I am very happy with the result. I get better fuel economy at 85 kph than at 75. (53 vs 47 mph) Given these cars are as streamlined as a house brick, the drag at 85 is much greater than at 75, yet the economy is better. About 22 mp(US)galon vs about 20. I figure that is about the speed where cam, compression and carburettor all come together to work properly. It is easy to overdo things in there. I decided to go with standard valves partly because I could see that larger valves wouldn't give much benefit because they would be shielded to a greater degree than standard ones. Besides, it would have affected warranty and the hardened seat were already fitted.
We run 91 octane non ethanol fuel.

[Chris Haynes]

Originally Posted by updraught

This was on ebay, a hot rod mag from the early fifties. It is to do with early V8 heads, but deals with raising the compression. Just for interest ...
https://i.ebayimg.com/images/g/-6EAA...nj/s-l1600.jpg

I wish it was not so fuzzy and hard to read. Could you scan it instead of a picture?

[Tod]

Update: I started CNC cutting the tooling for this Weiand head today. It will take a few days to finish the pattern since I have other customer tooling I am cutting as well. Right now I have 3 different jobs taking up space in the one machine, with more waiting in line. I will be using 3D printed sand for the water jacket so I can get into testing asap. 2 of the chambers will be chambers that are proved to be very good, and the 9:1 chamber will be made last.


Tod

[Tod]

Sneak peek at the finish pass being cut on the Weiand style prototype pattern.


Tod

[Tod]

Sponsored Links (Register now to hide all advertisements)

And here is the Weiand style head pattern with a first coat of pattern lacquer. I think it came out fine.



This will serve nicely to make prototypes.


Tod

[Flathead]

Very interesting, thanks for sharing your work.

[Tod]

Here is the Weiand style prototype pattern with a second coat of Pattern lacquer. Material is ready to cut the first of 4 combustion chamber options for these heads. The 8:1 option will be my own take on a Thomas style chamber. The 6 and 7:1 chambers will be what I offer in my Winfield heads, and are fashioned after the original Weiand and Winfield chambers. I have a chamber that is used in my Stock Top Crow Foot heads that will also work under this head. The first run of these looks to be spoken for as of now, unless I pour more castings, but I think I will keep it at 6 for now.


Tod