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JPM Ultimate 1776cc VW Aircooled
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Bloku
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PostPosted: Tue Feb 10, 2015 9:25 pm    Post subject: JPM Ultimate 1776cc VW Aircooled Reply with quote

Still picking up my jaw from the floor. What type of figures is this motor making!? It sounds so good. Also, check out those crazy cool EFI intakes.


Link

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GTV
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PostPosted: Tue Feb 10, 2015 9:30 pm    Post subject: Reply with quote

Made 249hp if I remember right.
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bugguy1967
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PostPosted: Tue Feb 10, 2015 10:14 pm    Post subject: Reply with quote

Those are JPM's roller throttle bodies. 249 sounds right. I know of another racer that had JPM build him a 1776 that was making slightly less HP with a more spartan setup.

Their 1915 makes about 270.

Imagine if they entered the builder showdown...
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Anvil
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PostPosted: Wed Feb 11, 2015 6:43 am    Post subject: Reply with quote

I'd like to see the dyno sheet on that. RPM's sounded crazy high.
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GTV
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PostPosted: Wed Feb 11, 2015 7:27 am    Post subject: Reply with quote

It is a 94x64 1776, not the traditional 90.5x69. From another forum:

Just finished on the dyno with the new 1776, all loaded up now for the long trip home from JPM.

You can see a short video clip on the JPM Facebook page (I tried to put a link here but failed).  Peak power at 10k the rev limiter is at 10,700rpm.

So peak power 249.7hp at the flywheel that's 140.6hp/litre 13.2 BMEP. Not to shabby for an old floppy mag cased 2 valve per cylinder pushrod engine.
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PostPosted: Wed Feb 11, 2015 7:46 am    Post subject: Reply with quote

That is one sweet sounding engine. Here is a nice shot of those throttle bodies.
Image may have been reduced in size. Click image to view fullscreen.
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esde
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PostPosted: Wed Feb 11, 2015 10:13 am    Post subject: Reply with quote

I'd be interested to know what they are doing to get those numbers out of such small displacement. I imagine the details might be somewhat guarded.
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PostPosted: Wed Feb 11, 2015 10:23 am    Post subject: Reply with quote

MacLeod Willy wrote:
That is one sweet sounding engine. Here is a nice shot of those throttle bodies.
Image may have been reduced in size. Click image to view fullscreen.

Um...my pants are tight.
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PostPosted: Wed Feb 11, 2015 10:38 am    Post subject: Reply with quote

It's guys like this that are dragging us out of 60's technology, kicking and screaming. Are we ready to catch up with the rest of the automotive world? I have really been learning to appreciate EFI and crank trigger ignition systems the last few years Very Happy
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PostPosted: Wed Feb 11, 2015 10:51 am    Post subject: Reply with quote

esde wrote:
I'd be interested to know what they are doing to get those numbers out of such small displacement. I imagine the details might be somewhat guarded.


Here's one: Peak power at 10k the rev limiter is at 10,700rpm.
Nonetheless, impressive to see what can be squeezed out. Practical? Umm...depends. What's your idea of practical? I imagine that cam has some killer duration and lift. Sounds like the running idle is higher than 1k. Wicked sounding.
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Dan Ruddock
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PostPosted: Wed Feb 11, 2015 11:15 am    Post subject: Reply with quote

I would like to know what he is doing to control the valves. Dan
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PostPosted: Wed Feb 11, 2015 11:26 am    Post subject: Reply with quote

Dan Ruddock wrote:
I would like to know what he is doing to control the valves. Dan


looks like a roller cam

https://www.facebook.com/permalink.php?story_fbid=341692812679152&id=178561615658940
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Dan Ruddock
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PostPosted: Wed Feb 11, 2015 11:33 am    Post subject: Reply with quote

theDrew wrote:
Dan Ruddock wrote:
I would like to know what he is doing to control the valves. Dan


looks like a roller cam

https://www.facebook.com/permalink.php?story_fbid=341692812679152&id=178561615658940


I should of said "keep the valves under control" Springs? Valve train weight?
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ArnoudH
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PostPosted: Wed Feb 11, 2015 11:39 am    Post subject: Reply with quote

It's a flat tappet cam.From wat I gathered is that valvefloat limited the amount of horsepower to 249Hp.He had an more agressive cam but it caused misfires.
Did you notice the steel plates attached to the sides of the crankcase?
With the old engine:
http://youtu.be/Cs5dHwTLqmQ
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Dan Ruddock
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PostPosted: Wed Feb 11, 2015 12:37 pm    Post subject: Reply with quote

Kind of sounds like a motorcycle engine or a well tuned Honda Vtec.

Dan
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PostPosted: Wed Feb 11, 2015 12:37 pm    Post subject: Reply with quote

theDrew wrote:
Dan Ruddock wrote:
I would like to know what he is doing to control the valves. Dan


looks like a roller cam

https://www.facebook.com/permalink.php?story_fbid=341692812679152&id=178561615658940

Don't know if that's what he used in the engine, but that pic is definitely a roller cam.
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Anvil
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PostPosted: Wed Feb 11, 2015 12:47 pm    Post subject: Reply with quote

Can't question the results but doesn't it seem like that ball valve style of throttle opening would result in some weird turbulence at less than full throttle?
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GTV
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PostPosted: Wed Feb 11, 2015 12:48 pm    Post subject: Reply with quote

Discussion of the engine starts here near the bottom of the page:
http://cal-look.no/lounge/index.php/topic,3257.690.html

And the thread on the car is here (not completely up to date though):
http://cal-look.no/lounge/index.php/topic,3257.690.html
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PostPosted: Wed Feb 11, 2015 12:57 pm    Post subject: Reply with quote

GTV wrote:
Discussion of the engine starts here near the bottom of the page:
http://cal-look.no/lounge/index.php/topic,3257.690.html

And the thread on the car is here (not completely up to date though):
http://cal-look.no/lounge/index.php/topic,3257.690.html

Thank you for the links.
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raygreenwood
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PostPosted: Wed Feb 11, 2015 1:09 pm    Post subject: Reply with quote

Anvil wrote:
Can't question the results but doesn't it seem like that ball valve style of throttle opening would result in some weird turbulence at less than full throttle?


Actually it will result in considerably less turbulence in the manifold.

I did some experiments about 10 years ago with a bullet shaped throttle plate replacement on a plenum style manifold. Others have done experiments as well.

The plume of turbulence created by a normal style throttle plate is actually huge. Typically at high rpm and airflow the throttle plate turbulejce plume length will be 7-10X the throttle plate diameter. The throttle shaft itself at WOT has its own pe uliar rippling turbulence plume.

Nice piece of design in those TBs. Ray


Last edited by raygreenwood on Wed Feb 11, 2015 3:27 pm; edited 1 time in total
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