twin cam aircooled heads

[flxzcat]

Also for those interested check out the Porsche OHC system adapted to a T1

http://www.aichlseder.info/d_index.htm

See "Technik" and also "OHC" on the left side of the page. Lots of pictures with German text. click "weiter" to the right under the picture to move forward

[flxzcat]

[quote="Wreck"]Not twin cam but still multivalve , plus a bit further up from design stage . I hope Wally is able to get it working .

see http://www.apfelbeck.nl/

[VWporscheGT3]

I couldn't find a good picture in the limited amount of time I was looking , but the 4 cam Porsche (fuhrman) cylinder heads almost ran "too cool" evn at full tilt while racing from what first hand Porsche engineers said back in the day. would love to know what the cht readings were .

but if someone found a good picture of the cylinder heads the fins were quite large , lots and lots of surface area. and the fans used in those so sexy shrouds were pretty damn wide. just another 2 cents... sorry.
_________________
If you have any questions about Forged ICON 4032 VW pistons just shoot me a line.

[Wreck]

Not twin cam but still multivalve , plus a bit further up from design stage . I hope Wally is able to get it working .

https://www.thesamba.com/vw/forum/viewtopic.php?t=732502&highlight=beetspeed

[-Alex77-]

I have once designed dohc 16v heads, mostly for fun..

Noticed that WBX headstud spacing fits better with cams/springs/followers.

_________________
Lasercut parts and CAD design

[Chickensoup]

I would want a properly designed Hemi chambered head with the exhaust ports facing downward before i even thought about an ohv design. Thats just my opinion of course and what im interested in, as for an ohv engine does have some advantages, however, neither are equal.

oh wait... we do have hemi heads.... porsche
_________________
-'85 c10 5.3 LS, cam, heads, long tubes, x pipe, 3 inch spin tech's
-'01 e46 325ci *tree modded
-'05 B5.5 TDI Wagon 17in sport rims ;EGR + BSM + ASV Delete, Stage-2 Tune, straight pipe
'65 Tourist Delivery Build
'66 RIP

[flxzcat]

Long dead thread I know but adding 02 cents worth for future parties that stumble across this.

Regarding hot exhaust port on air cooled 4v head.

One possible way to substantially reduce temp in that area is to use a stainless steel sleeve tube within the port that is pressed in and/or fastened from the outside surface that includes an air gap between the aluminum head casting and the tube. The tube would need to extend to and bottom out near the valve seat location to have maximum effect. the air gap is a couple of mm.

Mazda uses something like this on each of the very very hot exhaust ports (2 per rotor?) of the Renisis RX8 rotary valve engine. The ss tubes that Mazda uses are curved in a traditional port like shape (if I'm recalling correctly)

Maybe we can revive this potentially interesting thread.

Cheers, Paul VDL

[Vanapplebomb]

Not a DOHC, but still an air cooled Tatra V8 engine. If this fits in a bug with a little modification, then why not the later DOHC engine?

_________________
1800 Type 4 Berrien 295

http://www.thesamba.com/vw/forum/viewtopic.php?t=487021

[56bugdan]

Well that's pretty damn cool! Anybody remember the movie Wraith with Charlie Sheen from 1986? That first car looks a lot like the one he drove only the one he drove had a Chrysler pentastar on it. Is that a mid or rear engine car? Very cool information and for some reason it's never mentioned in any of the VW history books I've read. Go figure! I didn't think there were any air cooled vehicles being made anymore. Shows how much I know! Thanks Vanapplebomb!

[williamM]

But will it fit in a BAY?
_________________
some days I get up and just sit and think. Some days I just sit.

opinion untempered by fact is ignorance.

Don't step in any!

[Vanapplebomb]

Tatra is the 3rd oldest automobile manufacturer in the world. They used to make a lot of luxury cars, famous for their rear engine air cooled V8 engines. Very sophisticated stuff. They continued to produce them until about the year 2000. They made a race car with a modified version of the above engine that pushed 400 horsepower that was wicked fast. Currently they only do massive military vehicles...ya know, six, eight, even tex axles. Interestingly, their biggest models are still powered by massive V8 an V12 air cooled diesel engines made in house. Crazy stuff.

Oh, and Dr. Porsche did a lot of looking over their shoulders when designing the bug. This eventually ended up with Tatra suing VW the the 1960's for copying their tunnel chassis design from the 30's.

In the early 1940's Tatra mastered the art of air cooled engines, and never produced another water cooled engine from that point forward. To this day, all the engines they produce in house are air cooled.

Air cooled Tatra stuff...

_________________
1800 Type 4 Berrien 295

http://www.thesamba.com/vw/forum/viewtopic.php?t=487021

[PumaVW79]

[56bugdan]

[Quokka42]

Maybe the OP will see this, do a little development, and put it on Kickstarter. You just never know these days.
_________________
There has only ever been one man who was perfect, and they nailed Him to a cross.

[Vanapplebomb]

Just for fun, Tatra made loads of dual overhead cam air cooled v8 engines for their 613 luxury passenger car.

_________________
1800 Type 4 Berrien 295

http://www.thesamba.com/vw/forum/viewtopic.php?t=487021

[Glenn]

[VWporscheGT3]

[aawright18]

Hey i know this post is long dead but maybe the op will see.
I like that Cad image is that solid works you used?
Did you ever try creating a usable prototype?
I am in school for Mechanical engineering and am thinking some something similar but for a cam-less servo motor valve actuation.
_________________
70 bug daily driver /project

[Jake Raby]

Multiple exhaust valves CAN cause over temp issues, just as a single exhaust valve can that is too big too be suported by the port or exhaust system.
_________________
Jake Raby
Raby Engine Development
www.rabyenginedevelopment.com
"I've never given anyone Hell, I just told them the truth and they thought it was Hell"

[BugUser]