My BP DOHC naturally asp. engine build

wozzah1975 · Postby **wozzah1975** » Tue Nov 01, 2011 7:29 pm

Davex3 wrote:Have you seen the boundary engineering chromoly race pumps?

http://boundaryengineering.com/drupal/node/36

No I hadn't, but they look the goods, maybe for the next block build. Are you running one?

Woz

timk · Postby **timk** » Tue Nov 01, 2011 10:57 pm

Awesome build! I'd love to have something like that in my track car. Can I pay you in liquid currency to build me a head like that? :lol:

wozzah1975 · Postby **wozzah1975** » Tue Nov 01, 2011 11:04 pm

Davex3 wrote:
wozzah1975 wrote:No I hadn't, but they look the goods, maybe for the next block build. Are you running one?

Woz

Nah, haven't opened my engine and don't rev it high enough to need one. 200rwhp is about all my budget can afford at the moment . Apparently they are the go but.

Thanks for the link, will def look at it for the next block build

Woz

wozzah1975 · Postby **wozzah1975** » Tue Nov 01, 2011 11:06 pm

saboteur wrote:Awesome build! I'd love to have something like that in my track car. Can I pay you in liquid currency to build me a head like that?

Cheers, how much and what type of liquid are we talking?

Woz

sailaholic · Postby **sailaholic** » Wed Nov 02, 2011 8:08 am

did you use the later nb high port head? Or the na head?

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Locutus · Postby **Locutus** » Wed Nov 02, 2011 9:53 am

loving this thread. :NETPOINTZ:

sailaholic wrote:did you use the later nb high port head? Or the na head?

pretty sure that's the NA8 head.

wozzah1975 · Postby **wozzah1975** » Wed Nov 02, 2011 2:09 pm

sailaholic wrote:did you use the later nb high port head? Or the na head?

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It was an early head,

Woz

wozzah1975 · Postby **wozzah1975** » Wed Nov 02, 2011 5:26 pm

Davex3 wrote:How are your temps on track? You should have a look at doing at coolant re-route as #4 runs a lot warmer than the others due to the engine origionally being an east west design. Apparently helps with longevity on track. Either that or just get a late model (03 - 05) MX-5 head gasket.

Yeah, the old Pinto engine use to do the same thing. I rectified the problem by running a bypass to the back of the block from the bypass pipe on the waterpump, same as the pinto engine, Problem solved

Cheers
Woz

wozzah1975 · Postby **wozzah1975** » Thu Oct 04, 2012 8:52 pm

Quick update.

I had some new pipes made for the car over the last few weeks.

Heading down for a dyno on Tuesday night, but so far so good. Massive improvement from 5000rpm onward

https://www.facebook.com/photo.php?fbid ... =1&theater
https://www.facebook.com/photo.php?fbid ... =1&theater

Ready for the Winton 6hr

Cheers
Woz

16bit · Postby **16bit** » Fri Oct 05, 2012 11:45 am

awesome to the max. 150rwkw here you come!!!

wozzah1975 · Postby **wozzah1975** » Wed Oct 10, 2012 1:07 am

This is the latest of the developement on my car with the new pipes from Brae Fabrication fitted (my recipe, his hands on experience). We had a number of runs playing around with mixtures, cam timing etc. The end result was 151rwkw which is 14rwkw up on the old pipes. You will also notice a dip in the curve between around 5700 and 6300rpm, except on the run with pink line on the graph. We tried a number of different things to correct the dip but the changes still left the problem there. Both my dyno man and I suspect an air speed problem relating to scavenging. The carbs currently have a 70mm long Weber style ram tube fitted. I didn't have any short ones to try, so we removed the ram tubes. Although it upset overall power which we expected it also got rid of the dip as you'll notice on the chart with the pink line. The next step will be to play around with some better designed short ram tubes, and/or the secondary length on the pipes. Overall a good result, and lots learnt.

Dyno Chart Here
https://www.facebook.com/photo.php?fbid ... =1&theater

Dyno run Video Here
https://www.facebook.com/photo.php?v=41 ... =2&theater

Cheers
Woz

Postby **NitroDann** » Wed Oct 10, 2012 9:06 am

Looks like you are dropping around 20kw where the dip is, which is a lot even if you are making over 150rwkw. Does the wastegate arm move freely? Boost leak perhaps?

Dann