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Bloku
Expert Noob
Joined: April 09, 2013
Posts: 562
Location: Tulsa/Jenks Oklahoma
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 Posted: Tue Feb 10, 2015 9:25 pm Post subject: JPM Ultimate 1776cc VW Aircooled |
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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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VW's:
1971 Karmann Ghia
1975 VW-Porsche 914
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Other Fun Cars:
1976 BMW 2002 (Bored and Stroked w/ 5-Speed)
1989 Toyota 4x4 PU
1994 BMW E36 (Backup Daily)
2001 Porsche 996 C2 Manual (Daily) |
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GTV
Samba Member
Joined: March 27, 2004
Posts: 2084
Location: Si'ahl
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| Posted: Tue Feb 10, 2015 9:30 pm Post subject: |
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Made 249hp if I remember right.
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EMPI Power Rules! |
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bugguy1967
Samba Member
Joined: January 16, 2008
Posts: 4368
Location: Los Angeles, CA 90016
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| Posted: Tue Feb 10, 2015 10:14 pm Post subject: |
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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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"A petrol engine can start readily, run smoothly and give every appearance of being in good order, without necessarily being in good tune." - Colin Campbell, "The Sportscar Engine" |
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Anvil
Samba Member
Joined: September 28, 2009
Posts: 248
Location: Golden, Colorado
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| Posted: Wed Feb 11, 2015 6:43 am Post subject: |
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I'd like to see the dyno sheet on that. RPM's sounded crazy high.
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GTV
Samba Member
Joined: March 27, 2004
Posts: 2084
Location: Si'ahl
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| Posted: Wed Feb 11, 2015 7:27 am Post subject: |
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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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MacLeod Willy
Samba Member
Joined: February 18, 2014
Posts: 933
Location: Ontario Canada
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| Posted: Wed Feb 11, 2015 7:46 am Post subject: |
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That is one sweet sounding engine. Here is a nice shot of those throttle bodies.
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esde
Samba Member
Joined: October 20, 2007
Posts: 6321
Location: central rust belt
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| Posted: Wed Feb 11, 2015 10:13 am Post subject: |
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| 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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Anvil
Samba Member
Joined: September 28, 2009
Posts: 248
Location: Golden, Colorado
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| Posted: Wed Feb 11, 2015 10:23 am Post subject: |
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| MacLeod Willy wrote: |
That is one sweet sounding engine. Here is a nice shot of those throttle bodies.
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Um...my pants are tight.
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TinCanFab
Samba Member
Joined: April 04, 2006
Posts: 2743
Location: Waterford, California
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jfats808
Samba Member
Joined: December 10, 2007
Posts: 5022
Location: oahu hawaii
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| Posted: Wed Feb 11, 2015 10:51 am Post subject: |
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| 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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| Rockstar Suzuki wrote: |
You might as well put 10 year build in your bullshit sig, as it will NEVER run. Also your a dick |
You can always learn something new, even from a fool.
Check your oil levels routinely! |
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Dan Ruddock
Samba Member
Joined: October 25, 2012
Posts: 3668
Location: Sarasota, in my adopted state of Florida
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| Posted: Wed Feb 11, 2015 11:15 am Post subject: |
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| I would like to know what he is doing to control the valves. Dan |
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theDrew
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Joined: May 17, 2011
Posts: 1155
Location: Camas, WA
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Dan Ruddock
Samba Member
Joined: October 25, 2012
Posts: 3668
Location: Sarasota, in my adopted state of Florida
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| Posted: Wed Feb 11, 2015 11:33 am Post subject: |
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I should of said "keep the valves under control" Springs? Valve train weight? |
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ArnoudH
Samba Member
Joined: December 30, 2008
Posts: 177
Location: The Lowlands
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| Posted: Wed Feb 11, 2015 11:39 am Post subject: |
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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
Samba Member
Joined: October 25, 2012
Posts: 3668
Location: Sarasota, in my adopted state of Florida
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| Posted: Wed Feb 11, 2015 12:37 pm Post subject: |
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Kind of sounds like a motorcycle engine or a well tuned Honda Vtec.
Dan |
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Anvil
Samba Member
Joined: September 28, 2009
Posts: 248
Location: Golden, Colorado
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| Posted: Wed Feb 11, 2015 12:37 pm Post subject: |
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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
Samba Member
Joined: September 28, 2009
Posts: 248
Location: Golden, Colorado
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| Posted: Wed Feb 11, 2015 12:47 pm Post subject: |
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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
Samba Member
Joined: March 27, 2004
Posts: 2084
Location: Si'ahl
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Anvil
Samba Member
Joined: September 28, 2009
Posts: 248
Location: Golden, Colorado
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| Posted: Wed Feb 11, 2015 12:57 pm Post subject: |
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Thank you for the links.
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 23105
Location: Oklahoma City
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| Posted: Wed Feb 11, 2015 1:09 pm Post subject: |
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| 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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