Beetle 1300 Single Port Heads Headache

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Tony Z
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Re: Beetle 1300 Single Port Heads Headache

Post by Tony Z »

spacers will move the heads away from the piston, it'll reduce the compression as required, but it;ll kill all performance and lead to a very poor combustion chamber which may detonate easily.


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Re: Beetle 1300 Single Port Heads Headache

Post by 73type2 »

Yes, I don't want to go there. I hope that somebody else could get use out of them, so I'll phone the guy Brian mentioned.
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Re: Beetle 1300 Single Port Heads Headache

Post by retrovan »

Tony Z wrote: Tue Apr 06, 2021 9:03 am spacers will move the heads away from the piston, it'll reduce the compression as required, but it;ll kill all performance and lead to a very poor combustion chamber which may detonate easily.
I hear what you are saying, but no body will cut a head to :bn: if it can not be used.

May not be as easy as implied, but only a part of the concept. I always see a challenge......

Surely there must be a combination of parts to make these heads work, longer barrels, longer con rods, shorter tubes, custom exhaust, custom intakes, and lifters, something ...?

If you know the combination, you may want to keep them or it will enable the next guy to get whats needed to make these heads work.

Thats where I am going with this, Must be a super engine when done, wow... someone will get joy out of it.

OMO

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Re: Beetle 1300 Single Port Heads Headache

Post by calooker »

Those heads have been fly cut to the max approx. 4mm deep and in doing so 1 row of fins has been sacrificed for the top of sleeve not to bottom out, secondly the combustion chamber has been hacked out to get the CR to a more desired level. Those are race heads where everything that goes with them is custom.
For what it's worth, ignorance has no limits ......
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Tony Z
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Re: Beetle 1300 Single Port Heads Headache

Post by Tony Z »

retrovan wrote: Tue Apr 06, 2021 2:06 pm
Tony Z wrote: Tue Apr 06, 2021 9:03 am spacers will move the heads away from the piston, it'll reduce the compression as required, but it;ll kill all performance and lead to a very poor combustion chamber which may detonate easily.
I hear what you are saying, but no body will cut a head to :bn: if it can not be used.

May not be as easy as implied, but only a part of the concept. I always see a challenge......

Surely there must be a combination of parts to make these heads work, longer barrels, longer con rods, shorter tubes, custom exhaust, custom intakes, and lifters, something ...?

If you know the combination, you may want to keep them or it will enable the next guy to get whats needed to make these heads work.

Thats where I am going with this, Must be a super engine when done, wow... someone will get joy out of it.

OMO

Herman
They can be used, likely very successfully in the application they were made for - Formula Vee
Look at how those chambers are ported.
Those heads would have been cut quite a bit (4mm as Rui says) to increase the compression far more than usable, then ported to unshroud the valves as per the picture and to bring the compression back to a reasonable value, then possibly flycut again to get the compression to where they wanted it.

They might be able to work on the street, but you'll need 100 or 106 octane
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Re: Beetle 1300 Single Port Heads Headache

Post by retrovan »

Thanks Guys, much appreciated all that info,

Sure some one will benefit by it and now be able to put a label on them for future use.

Thanks Again

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Re: Beetle 1300 Single Port Heads Headache

Post by 73type2 »

Thanks for all the input, guys. I'll put the heads in storage for now and if anybody needs them, just let me know.
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Re: Beetle 1300 Single Port Heads Headache

Post by 73type2 »

retrovan wrote: Tue Apr 06, 2021 2:06 pm
Tony Z wrote: Tue Apr 06, 2021 9:03 am spacers will move the heads away from the piston, it'll reduce the compression as required, but it;ll kill all performance and lead to a very poor combustion chamber which may detonate easily.
I hear what you are saying, but no body will cut a head to :bn: if it can not be used.

May not be as easy as implied, but only a part of the concept. I always see a challenge......

Surely there must be a combination of parts to make these heads work, longer barrels, longer con rods, shorter tubes, custom exhaust, custom intakes, and lifters, something ...?

If you know the combination, you may want to keep them or it will enable the next guy to get whats needed to make these heads work.

Thats where I am going with this, Must be a super engine when done, wow... someone will get joy out of it.

OMO

Herman
I get what you're saying, Herman. I might do the experiment with a spare engine and parts I have lying around. By the looks of it, I need to modify the intake manifold, silencer, pushrod tubes and pushrods. I have some spare 1200 parts which might work. I know the 1200 intake won't work, but I hope the 1200 pushrods might work. Collapsible tubes will take care of the shortened tube length.
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Re: Beetle 1300 Single Port Heads Headache

Post by retrovan »

73type2 wrote: Tue Apr 06, 2021 8:05 pm ....... I might do the experiment with a spare engine and parts I have lying around. ....
Agree with you, the little bit of work to do those modes will be well worth it

And if you already have the other bits, ....what an exciting project,

I am jealous but filled with excitement for you

Have fun with it.

Herman
1952 Split Beetle 1835cc (Azure Blue)
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1972 Low Light Bay Panel Van 2Lt type 4(White)
1975 Fleetline Panel Van 1914cc (Aqua Blue/White)
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