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[email protected] Samba Member
Joined: June 24, 2015 Posts: 715 Location: Rialto. CA
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Posted: Fri Jan 13, 2023 5:45 pm Post subject: Valve size |
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What's your guys thoughts on 40x32 valve size on okrasa heads ....I know porsche 356 on there 73.5 bore used 38x31 valves on there heads ....what are your thoughts on this set up ??? |
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Bub Samba Member
Joined: June 10, 2004 Posts: 1143 Location: Central Washington
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Posted: Sat Jan 14, 2023 6:37 pm Post subject: Re: Valve size |
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What other specs ? displacement and fueling?
We love big valves, but they have to be matched to the build. _________________
hitest wrote: |
Had a girlfriend once who shall we say, nearly arrived at the mere sight of a semaphore in action- easy to please she was... |
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[email protected] Samba Member
Joined: June 24, 2015 Posts: 715 Location: Rialto. CA
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Posted: Sat Jan 14, 2023 7:05 pm Post subject: Re: Valve size |
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Bub wrote: |
What other specs ? displacement and fueling?
We love big valves, but they have to be matched to the build. |
Well my plans were to build an okrasa but ..I'm just gonna stick with building my own vw 36hp hemi heads after all like I have been planing ..yes hemi heads ...my all time dream engine is the porsche type 367 engine I'm obsessed with that engine/ motor ....I want a challenge so I'm gonna keep the build to 1100cc yes I know why so small build ....I will be going 64x75 the porsche type 369 1100cc used a bore of 73.5 with 38x31 valves ...the heads I have I can get 40x32 valves with a 75 bore I can also just go with 38x31 valves but was wondering would I benefit with the bigger valves compression I'm looking at will be 9to 1 or 9to 5 ... there are some folks who would say big valves are not good for a 1100cc but yet porsche was successful with there big valve heads ..honda 400t motorcycle heads use a 3 valve 2x 26mm intake 32 exhaust that would be 52mm intake vs 32mm exhaust with a 70.5 bore if they were successful with there heads why not a 40x32 valve head on a 75 bore ... |
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[email protected] Samba Member
Joined: June 24, 2015 Posts: 715 Location: Rialto. CA
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Posted: Sat Jan 14, 2023 7:06 pm Post subject: Re: Valve size |
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Bub wrote: |
What other specs ? displacement and fueling?
We love big valves, but they have to be matched to the build. |
Porsche type 367😍😍👇👇👇
https://youtu.be/JIkx0gzNumQ |
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OMT Samba Member
Joined: January 18, 2004 Posts: 296
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Posted: Sun Jan 15, 2023 3:37 pm Post subject: Re: Valve size |
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Hello Jerry,
Thank You for posting the video link.
Very unusual engine, very rare engine.
Best Regards,
Al |
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sgmalt46 Samba Member
Joined: April 20, 2005 Posts: 1293 Location: south san francisco
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Posted: Mon Jan 16, 2023 9:30 am Post subject: Re: Valve size |
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thanks for the vintage speed porno. made my morning. _________________ 55 deluxe 23 window bus
64 crew cab
55 rag top beetle
66 beetle
71 square back (sold) ! good luck with it Henry!
46 beetle 552nd royal army service corps CCG |
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Bub Samba Member
Joined: June 10, 2004 Posts: 1143 Location: Central Washington
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Posted: Mon Jan 16, 2023 9:59 am Post subject: Re: Valve size |
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Seems like you're really starting from scratch on this and would take some math to work out optimum combo. That 40mm intake is half the size of your bore. I guess cam and rocker geometry is going to figure it pretty big for this project.
40mm intake valve feels big to me, but I couldn't even guess if that is a benefit due to that intake /exhaust port design or what... _________________
hitest wrote: |
Had a girlfriend once who shall we say, nearly arrived at the mere sight of a semaphore in action- easy to please she was... |
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Alstrup Samba Member
Joined: July 12, 2007 Posts: 7183 Location: Videbaek Denmark
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