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> 4 valve DOHC engine aircooled
bugat5speed
post Feb 13 2008, 02:25 AM
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Hi together,

I´m from Germany and have a company called Bug @ 5-Speed. Do a lot with Porsche 5-Speed gearboxes, sports shifters and other things. Have a new project running which is a new flat 4 engine for vintage cars like Porsche 356, 914, 912, VW Beetle and others. The engine is a 4-valve DOHC engine with a own crankcase with 5 bearings. Attached some pictures of the heads. I have molds for the heads and other parts and I have a own milling centre to machine the parts. The engine will give a reliable high power. We expect easy 100 PS per 1.000 cc. The capacity will be between 2.000 and 2.500 cc. The engine will reach high revvs (8.000 and more) and will stand this due to the 5 bearings of the crankshaft.
The design of the engine will be a little like the one of the old Porsche 356 Carrera engine. So it also fits vintage cars what concerns the look of it.

Am currently checking the interest of people and would be very pleased about replies to my posting. I hope that I´m in the correct column and that nobody of the admins minds this information.

The engine will not be cheap, as it is developed completely new. Can´t give an exact price at the moment.

Will check the forum regularly, but also would like to answer some mails on this matter.

Thank you for your interest

Martin Bott
Bug @ 5-Speed Germany
www.bugat5speed.de
info@bugat5speed.de


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Attached File  Zylko_mit_Komp._111107_4.pdf ( 141.13k ) Number of downloads: 736
Attached File  Zylko_re_li_mit_Komp._2_070907.pdf ( 101.17k ) Number of downloads: 725
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Twystd1
post Feb 13 2008, 02:46 AM
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You don't want to know... really.....
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Hi Martin,

I have been following your goods since you first started the Vdub shifters.

I still want to try one of those in a 914. Just to see if they work better than the other alternatives.

That chamber roof combo should work well. And the bottom end pics I saw on the STF site LOOKS strong as hell.

When do you think you will start the first dyno runs? This year?

I am looking forward to seeing more as time progresses.

Cheers and best of luck...!!!!!!!!!

Clayton
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Mikey914
post Feb 13 2008, 10:53 PM
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Looks like a great idea. Interested to see how pricing works out. Probably best sold as a long block.

Nice to see some "new" technology becoming available for our cars!
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alpha434
post Feb 13 2008, 11:48 PM
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I would've thought that there'd be more of a response to this.

This is freakin' wicked.

My only questions.

What's angle/distance into the intake and exhaust?

And is it a swirl port chamber, or just "two in, two out"?

And are those heads cast iron?!?
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bugat5speed
post Feb 14 2008, 02:13 AM
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Hi,

the heads are cast aluminium. They are made by a faundry that has good experience in casting cylinderheads for aircooled vehicles.

The intake and exhaust both are vertiacally 90 degrees to the axis of the piston. The manifolds merge to each an oval shape. Means only one inlet and one exhaust per cylinder. Oval is the best floating shape for a 4-valve and is also best for the exhaust in general. Manifilds to the carbs or later to the fuel injection goes from oval to round. Will give pics on this later.

Hope my English is not too unhandy.


Martin
Bug @ 5-Speed
www.bugat5speed.de
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race914
post Feb 14 2008, 08:17 AM
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Hi Martin,

I'm very interested in your project and look forward to specs, test results, pics, prices, etc.

Thanks for posting on 914World.

Greg Braun
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alpha434
post Feb 14 2008, 02:23 PM
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Is there any accommodation for getting cooling air to the back side of the head, where the exhaust valves are?

Do you have a picture of just the ports and their shapes?

Are the cams out of something readily available? Or are they custom for application?

What does the block look like?
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Mikey914
post Feb 15 2008, 02:03 AM
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Looks like the valves will be zero clearance. Interested to see how the plug area holds up.
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914werke
post Feb 16 2008, 04:20 PM
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SICK!!!!
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SGB
post Feb 22 2008, 09:15 PM
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it's about time someone did this. Aircooling for autos will be back someday...
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silver arrow
post Mar 3 2008, 03:24 PM
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Interested to see dyno and final pricing. Any interest in building 4 valve heads that fit Type 4 motors?
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RJMII
post Mar 24 2008, 02:25 PM
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www.bugat5speed.de

check out his website!!! lots of great pictures. =o) Don't worry about reading German... just look for clues like "DOHC". (IMG:style_emoticons/default/wink.gif)
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914rat
post Mar 24 2008, 06:51 PM
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This could rock the entire air cooled world.How much $$$$.Talk about development WOW.
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749142
post Oct 20 2008, 09:56 PM
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cant friggin wait.
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turboman808
post Oct 23 2008, 04:58 PM
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Thats gonna be wicked. Can't wait to see the results.
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charliew
post Dec 6 2008, 11:47 AM
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I inquired awhile back about a neat short cast aluminum pan for the suby that Martin makes. It looked pretty good. I wanted a bigger, gated solution that I got from Kennedy and Speedway. I also like to make my own solutions.

Martin has a lot of advanced stuff.

I found out a long time ago (from vw's and motorcycles) that heat sucks power out of a air cooled motor a lot. The harder and longer you run it the slower it gets. The more power it makes the harder it is to keep it cool. At some point water gets better at cooling high performance motors. Mercedes has a elect. controlled water thermostat for their new bad a$$ v8. I like that.
When you add a drysump cooler of course it helps but the heads never really get the cooling they need for high tech performance.
Guys that like to spend a lot of money on cars should like this approach as it will cost more than you can imagine but it will be pretty neat at the same time.

More power to you Martin, I'm sure it will be very interesting.

The dollar exchange rate might improve our prices in the next year too.
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dinomium
post Jan 3 2009, 12:48 AM
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Git on a chair son, all the good stuff is goin over yer head!
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kwel site and stuff!
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Cap'n Krusty
post Jan 8 2009, 05:36 PM
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QUOTE(charliew @ Dec 6 2008, 09:47 AM) *



........ At some point water gets better at cooling high performance motors. Mercedes has a elect. controlled water thermostat for their new bad a$$ v8. I like that...........



BMW has electric thermostats in it's later model V-8s. I like 'em because, when they fail (and they DO fail) I get to sell not only a thermostat, but also an engine wiring harness and an ECU, as well as a TON of labor. Hey, it pays the rent ..................

The Cap'n
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dlestep
post Jan 8 2009, 07:30 PM
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...didn't Porsche test and run 4-valve heads in the late 60's, early 70's, I think for a run around targa floria and found it to be very high strung, with the power band way up at the top and I believe that it ran too hot. The 935 turbos had them and the 959. The 4 valves didn't reappear until they had water-cooling.

And I believe that in the mid 90's wasn't there a good ole German guy selling a 14K 4 valve kit for the 69-89 engines? I remember laying on the couch watching the news with the magazine open with the article and pics and just droolin' for hours staring at it with no intention of ever believeing that I could afford such a beautiful thing.....

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this is a POP 4-valve from the 80's isn't it beautiful !!
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shaqdiesel
post Feb 2 2009, 09:49 PM
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QUOTE(dlestep @ Jan 8 2009, 05:30 PM) *

...didn't Porsche test and run 4-valve heads in the late 60's, early 70's, I think for a run around targa floria and found it to be very high strung, with the power band way up at the top and I believe that it ran too hot. The 935 turbos had them and the 959. The 4 valves didn't reappear until they had water-cooling.

And I believe that in the mid 90's wasn't there a good ole German guy selling a 14K 4 valve kit for the 69-89 engines? I remember laying on the couch watching the news with the magazine open with the article and pics and just droolin' for hours staring at it with no intention of ever believeing that I could afford such a beautiful thing.....

Attached Image
this is a POP 4-valve from the 80's isn't it beautiful !!

What is this engine- am curious- if this is a foolish question sorry

RK
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