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Hybrid DOHC motor (DOHC head on SOHC block) 

 

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 Post subject: Re: Hybrid DOHC motor (DOHC head on SOHC block)
Posted: Sat Oct 12, 2013 2:41 am 
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Hi,

An advantage of doing this is the same engine number for rego. I have seen a Toyota push-rod engine with a factory DOHC head. Many motorbikes have an extra spark, ( like firing 2 at once ) and it works fine. At the end of the exhaust stroke, so it wont backfire.

I thought there was a DOHC aftermarket head made for the EA ? Interesting project though, I always like it when someone does " what cant be done " With a 3.1 block ( shorter stroke I thought ? ) It would make good power / revs without a Turbo. Oil may be an issue with continuous high Revs, I remember reading that they changed the Oil pump type for the extra 500 revs of the new engine to maintain proper lubrication

 

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 Post subject: Re: Hybrid DOHC motor (DOHC head on SOHC block)
Posted: Sat Oct 12, 2013 7:47 pm 
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turned out cutting and shutting the DOHC sump to suit e-series wasn't as impossible as was widely believed. so this project didn't need to be completed - with a lot of machining work it would have been possible but not worth the effort (when the sump mod was possible).

Had it turned out the sump couldnt be modified for clearance i would have continued down this path.

 

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 Post subject: Re: Hybrid DOHC motor (DOHC head on SOHC block)
Posted: Thu Apr 24, 2014 10:29 pm 
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I think you have given up too easily trying to put a DOHC head on a SOHC

Because the Holden Boys use Ford SOHC heads on their 186 blocks now.
they used to use 250xflows but OHC is more power.


Image

this is the 250xflow setup
Image

 

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 Post subject: Re: Hybrid DOHC motor (DOHC head on SOHC block)
Posted: Thu Apr 24, 2014 10:49 pm 
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holy s**t, i had heard of the 250xflow trick before (but didnt 100% believe it). it would be a ridiculous amount of work to do either of those conversions. i bet NONE of the head studs or oil/water galleries realy line up on one of those

 

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 Post subject: Re: Hybrid DOHC motor (DOHC head on SOHC block)
Posted: Fri Apr 25, 2014 7:57 pm 
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P100 Ute wrote:
I think you have given up too easily trying to put a DOHC head on a SOHC

Because the Holden Boys use Ford SOHC heads on their 186 blocks now.
they used to use 250xflows but OHC is more power.


Image

this is the 250xflow setup
Image


I noticed the head is on backwards for the Xflow head......cams are opposite sides, Xflow and Holden red 6.

 

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 Post subject: Re: Hybrid DOHC motor (DOHC head on SOHC block)
Posted: Sat Apr 26, 2014 8:05 am 
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Exposed cam drive looks like a bit of work is required to get these to fit.
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 Post subject: Re: Hybrid DOHC motor (DOHC head on SOHC block)
Posted: Sat Apr 26, 2014 9:19 am 
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fezlane wrote:
Exposed cam drive looks like a bit of work is required to get these to fit.


Yeah.....not something you can just whack together at home, eh?

 

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 Post subject: Re: Hybrid DOHC motor (DOHC head on SOHC block)
Posted: Sat Apr 26, 2014 6:44 pm 
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cjh wrote:
fezlane wrote:
Exposed cam drive looks like a bit of work is required to get these to fit.


Yeah.....not something you can just whack together at home, eh?


Definitely not, i would expect that even a lot of "professional" engine re builders wouldn't want to build one of these (or what i was working on with the falcon motors) it reeks of "old school engineer" to me. if fezlane hadnt managed to modify his DOHC sump to fit i would have pushed on with the project and started getting machining done.

 

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 Post subject: Re: Hybrid DOHC motor (DOHC head on SOHC block)
Posted: Sun Apr 27, 2014 12:37 am 
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96ELGli wrote:
Hi,
I thought there was a DOHC aftermarket head made for the EA ?



krogdhol heads ?

they actually fit both the ford and holden motors too
had DOHC as well as twin spark

 

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 Post subject: Re: Hybrid DOHC motor (DOHC head on SOHC block)
Posted: Sun Apr 27, 2014 9:37 pm 
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Pity they were so expensive. Could have been a lot of them running around by now.

 

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