Author Topic: Chopped single port head  (Read 4691 times)

Offline Kamcoman77

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Re: Chopped single port head
« Reply #15 on: September 17, 2020, 02:51:20 PM »
I briefly looked at the Scat heads, but decided against them because they have large valves and big ports for high rpm racing. At our rpm, we need small valves and small ports to keep the velocity of fuel-air mix high. This helps with throttle response, low-end torque, and fuel economy. If somebody is planning a VW with re-drive so they can turn 4000 to 6000 rpm (ouch), then big valves and ports will help with horsepower, but not low-end torque.

Offline Theodore

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Re: Chopped single port head
« Reply #16 on: September 18, 2020, 05:58:42 AM »
my first or early mechanical experience was drag racing (SIR in Seattle), my neighbor had three or four engines ready for the weekend racing, one race the engine would overheat and somthing would break.
yes i noticed Global used 'em thats why im been watching this issue, i suppose global may have have them made special idk. i have a stack of bad T4 heads out back, and a netal band saw and tig welder etc just no time.
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Offline Dan_

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Re: Chopped single port head
« Reply #17 on: September 18, 2020, 06:26:24 AM »
When I was a kid, the guy across the street raced autocross.  He always had a Corvair engine in the living room and a car outside with no engine in it.  One race, one engine. 

I once owned a 1966 140 hp Corsa with the 4 single barrel carbs.  I was only able to buy it if I agreed to sell it back.  I sold it back for the same price I gave for it.  I wish I still had it...

The Corvair heads are allegedly the strong point for that conversion.


“A superior pilot uses his superior judgment to avoid situations which require the use of his superior skills.”

– Frank Borman, Apollo 8 Commander

Offline Theodore

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Re: Chopped single port head
« Reply #18 on: September 18, 2020, 06:50:33 AM »
Ha! Yes wish had the cars from or youth once again, i traded my first car(55 Chev belair hardtop)in 1974 for my first motorcycle(Harley short track racer) but almost broke my back in a crash, thats when i was done with bikes...
hmm Dad was right, he said once 'you'll kill yourself on that motorcycle' maybe i listened? also had a friend die but he hit ice coming down the pass, yep done with 'em
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Offline Asman

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Re: Chopped single port head
« Reply #19 on: December 29, 2020, 08:26:40 PM »
got any better copies of the wfm files?  cant read the text and when you zoom in its just blocky pixels

I know this is an old post, but I thought others might find this helpful.
I was able to open the WMF files and zoom in on them readably using the "Draw" module in LibreOffice.  LibreOffice can be downloaded for free.  Now if I can just invert the color scheme :)

Offline Dan_

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Re: Chopped single port head
« Reply #20 on: December 30, 2020, 09:30:53 AM »
I know this is an old post, but I thought others might find this helpful.
I was able to open the WMF files and zoom in on them readably using the "Draw" module in LibreOffice.  LibreOffice can be downloaded for free.  Now if I can just invert the color scheme :)
Send it to me and I'll take a stab at it...  Do you mean invert the text color or everything..?


“A superior pilot uses his superior judgment to avoid situations which require the use of his superior skills.”

– Frank Borman, Apollo 8 Commander

Offline Asman

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Re: Chopped single port head
« Reply #21 on: December 30, 2020, 02:03:52 PM »
Send it to me and I'll take a stab at it...  Do you mean invert the text color or everything..?

I've attached the original WMF files in a Zip file.

Here is a link to the LibreOffice download:
https://www.libreoffice.org/download/download/

WMF is an old vector graphic format, not many current programs support it.  I was hoping to flip the black background and white text/lines. Draw has a color replace feature, but when I tried it the results weren't pretty.  I'll probably keep tinkering with it.

Offline Dan_

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Re: Chopped single port head
« Reply #22 on: December 31, 2020, 07:11:20 AM »
I meant to say, send me the files you enhanced with Libre Office and I will take a stab at reversing the colors of those files. 

However if you want, I will take a stab at reversing the originals and let you run them trough Libre Office again...


“A superior pilot uses his superior judgment to avoid situations which require the use of his superior skills.”

– Frank Borman, Apollo 8 Commander

Offline Dan_

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Re: Chopped single port head
« Reply #23 on: January 01, 2021, 09:40:26 AM »
I converted the .wmf files to png and they are very sharp and readable but not something you would want to print.  I attach those below in a zip folder.

It was taking way too much time to remove the black background and trying to get all the grey drawing lines changed to black.  I'm sure you could print them with the transparent background and have the lines print as black if you do not let your printer print in color.  So since you have Libre Office I will attach another zip file that you could use to print out the files using that software. 
still I would not set the printer to color.

Lemmie know if this does not work out and I will get all of them into .png file type with transparent background and Kinkos could print them for you.


“A superior pilot uses his superior judgment to avoid situations which require the use of his superior skills.”

– Frank Borman, Apollo 8 Commander

Offline Asman

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Re: Chopped single port head
« Reply #24 on: January 01, 2021, 04:40:26 PM »
I converted the .wmf files to png and they are very sharp and readable but not something you would want to print.  I attach those below in a zip folder.

It was taking way too much time to remove the black background and trying to get all the grey drawing lines changed to black.  I'm sure you could print them with the transparent background and have the lines print as black if you do not let your printer print in color.  So since you have Libre Office I will attach another zip file that you could use to print out the files using that software. 
still I would not set the printer to color.

Lemmie know if this does not work out and I will get all of them into .png file type with transparent background and Kinkos could print them for you.

I think I've got it as good as I can now.  I imported the WMFs into GIMP, scaled them up, inverted the colors, cropped them, exported as PNG. Then scaled them to 11x17 in LibreOffice and exported them as PDF, which I have attached (too much time on my hands I guess).  I don't have an 11x17 printer handy to test but they should be to scale now.

Let me know what you think.

Offline Dan_

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Re: Chopped single port head
« Reply #25 on: January 01, 2021, 06:00:20 PM »
Very AWESOME work...  I'm impressed..!



“A superior pilot uses his superior judgment to avoid situations which require the use of his superior skills.”

– Frank Borman, Apollo 8 Commander

Offline Theodore

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Re: Chopped single port head
« Reply #26 on: February 25, 2021, 10:40:57 AM »
i know this guy, has a Global engine ona LEXL, i didnt get a close look at the heads.
maybe Scat?
Dan_,
Plz show best thread for cutting crankshaft, a have Carr twin plans, wanting to put thrust bearing #2 position(near cut).
Thx Thanks Thank you!
Theo
""Take care of your wish""

Offline Dan_

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Re: Chopped single port head
« Reply #27 on: February 25, 2021, 06:42:35 PM »


“A superior pilot uses his superior judgment to avoid situations which require the use of his superior skills.”

– Frank Borman, Apollo 8 Commander

Offline Theodore

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Re: Chopped single port head
« Reply #28 on: February 26, 2021, 08:03:11 AM »
Thank you Dan,
we plan to use single thrust B at #2
next question for the experts,
Reduction drive on two cycl VW? I dont care about weight, EAB

https://lonestarhovercraft.com/product/predator-22-hp-belt-reduction-and-propeller/

""Take care of your wish""

Offline Dan_

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Re: Chopped single port head
« Reply #29 on: February 26, 2021, 09:11:15 AM »
The PSRU makes a real motor out of the 1/2 VW according to a phone call I made to Larry Smith of Valley Engineering. 

You cannot (must not) use one without electric start...  Larry broke his thumb. 

As you might imagine, the re-drive causes the pistons to "hit" multiple times during the normal hand prop swing.  By that time you may have lost a finger.

Raising the rpm will cause more heat to have to be dissipated, so one would need to keep an eye on CHT etc.


“A superior pilot uses his superior judgment to avoid situations which require the use of his superior skills.”

– Frank Borman, Apollo 8 Commander

 

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