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| | |-+  JPM heads, lets hear some feed back please
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Author Topic: JPM heads, lets hear some feed back please  (Read 5899 times)
Rocket Ron
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« on: October 18, 2008, 10:51:32 am »

I got to see these at EBI this year and they looked very good quality. I have noticed that the cars running them seem to be pushing out some impressive figures for their cc size.

It would be interesting to hear your feed back if you are running these heads. What are the specifications of your engines and running temps etc.

It would be fantastic to hear from someone that has hp figures for your engine before and after fitting them.

« Last Edit: October 18, 2008, 14:27:38 pm by rocket ron » Logged

13.12 @ 101.84

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bang
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« Reply #1 on: October 18, 2008, 16:01:01 pm »

 here is a link

http://www.shoptalkforums.net/viewtopic.php?t=121444

i got them on my 2779 oxyboxer. can only say good things about them Smiley
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Petter Carlberg
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« Reply #2 on: October 18, 2008, 22:26:32 pm »

Ive run my heads for three seasons now and are really happy with them. Im runnig a 2332 with 51mm IDAs, fk46. (will probably go for somethig wilder for next season) Up to now no issues with them, I love the heavy duty rocker assembly!

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Torben Alstrup
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« Reply #3 on: October 19, 2008, 08:59:24 am »

I built a 2387 with a Web 251 cam and JPM heads, 1,5 JPM rockers. 225 hp. After the dyno pul we found a couple of minor erros which gave noticeable more power. So Id say that it is over 230 hp now. It also "only" runs 11,7 - 1 CR at this stage. That will most likely be increased to 12,2 - 1 for the next season.
I can vouch for them.
T
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Tomi
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« Reply #4 on: October 20, 2008, 07:18:04 am »

I have JPM heads in my 84 x 101.6 street engine with FK91/89 cam, 1 7/8 header and 50mm throttle bodies. Compression is only 10.5:1. The engine made 241hp @ 6950rpm and  278nm @ 4950rpm through restrictive muffler running very rich, lambda 0.69 at worse. After the dyno pull I mapped the engine, got the lambda up to 0.82 - 0.85, and now it pulls much stronger through the whole rev range. Next I will raise the compression to 12:1, change to better flowing exhaust and tune some more. I'm really happy with the heads, they stay cool and I got these numbers with "out of the box" heads, no porting or anything. I'm also planning to send the heads to Johannes and get them ported to whole new level.
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Rocket Ron
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It's old school for a reason


« Reply #5 on: October 21, 2008, 20:28:23 pm »

wow some great figures there, you all seem to be running high cr ratios. It that because your also running fuel injection ?

anyone got these on a turbo car ?
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13.12 @ 101.84

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Roman
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« Reply #6 on: October 21, 2008, 20:54:19 pm »

The CSP Turbo Ghia has them!
http://blogsimages.skynet.be/images_v2/002/548/818/20080819/dyn006_original_640_480_jpeg_2548818_9140f38ceb06d46babdb7a6b4e311703.jpg

The reason many people has high compression on them is that high compression is free horsepower. If you build an engine with JPM heads you are looking for that extra and tend to go as high as you can.
JPM has 10.6 compression in his own daily driver 2276, making 222 hp.
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richie
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« Reply #7 on: October 21, 2008, 21:05:26 pm »

Got mine sitting here,but not managed to mate them with a bottom end yet,hopefully in a few weeks and yes they will be turbo Smiley

cheers richie
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bang
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« Reply #8 on: October 21, 2008, 21:27:39 pm »

cool richie.. what size of engine is that. where about do you live, i work neer norwich, do you guys meet up and talk race and kick tyres?
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Torben Alstrup
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« Reply #9 on: October 22, 2008, 10:25:14 am »

Bang, Ritchie is from England. You know who he is. Think big wheelies in a vert  Wink
T
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Lids
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« Reply #10 on: October 22, 2008, 11:10:02 am »

Richie your heads looked like they should be auctioned at Southerbys.  A work of art, I hope you use perspex barrels so we can see them at work.
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Ragtop
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« Reply #11 on: October 22, 2008, 12:07:35 pm »

Hi!

I also got a set to my new racecar. They will be on a 2332 with autronic sm2 EFI, E85, Big turbo. Will be interesting how the combo will work out.
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andy M.
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« Reply #12 on: October 22, 2008, 13:49:37 pm »

just out of interest what is the price on a pair of jpm heads

andy
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L.B.C.R.
Rocket Ron
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It's old school for a reason


« Reply #13 on: October 24, 2008, 20:58:31 pm »

Got mine sitting here,but not managed to mate them with a bottom end yet,hopefully in a few weeks and yes they will be turbo Smiley

cheers richie

It I'll be really interesting to see what sort of power they make over your current heads. 

 Hows it going, any other races coming up on that side of the pond ?
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13.12 @ 101.84

Grooving out on life

You can't polish a turd but you can roll it in glitter
vwxtc4free
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« Reply #14 on: November 05, 2008, 00:49:29 am »

just out of interest what is the price on a pair of jpm heads

andy
x2

Also is the black coating some sort of heat sheding coating also? Those throttle bodies are NICE also! The engine pic in the new Hotvws is also BADASS!
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