Lotus Elan

Dry Sumped Racing Engine ideal oil pressure

PostPost by: SJ Lambert » Fri Nov 25, 2011 1:17 pm

jkolb wrote:Johnson Pump Question

I have a Johnson pump (Mick) installed and just had a complete failure of oil pressure on start-up. Jackshaft is intact (engine ran until I shut it down), tank is full of oil, and I had not broken any of the line connections since the previous time the engine had run (7 days previous). Only about 25 minutes of time on the engine, none at high load. Engine is running 20-50 wt Valvoline racing oil and the oil was preheated to 120F.

Any thoughts? I have verified that the gauge is operating and am about to pull the pump which, as you can imagine, is no fun!

Jerry



How'd you end up with the pressure/pump Jerry??

James
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PostPost by: foggy » Tue Jan 03, 2012 12:59 am

found a nice piece the other day on the web from an engineering company.. now lost...

but this one is a little less nice, though fun for us engineers to decipher:
http://www.substech.com/dokuwiki/doku.p ... al_bearing

thanks to all for their empirical observation on oil pressure.

Steve
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PostPost by: elj221c » Tue Jan 03, 2012 11:04 am

Some more opinions from the era. Means of adjustment shown on the Cosworth pump.
Attachments
CosworthMk12.4.jpg and
CosworthMk12.3.jpg and
Vegantune.2.jpg and
BRM Type 84.3.jpg and
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PostPost by: Vaughan » Tue Jan 03, 2012 11:30 pm

Hi Roy,

My 26r was delivered new from factory with dry sumped Cosworth engine, which is still fitted, numbers all match factory records, I'd be very interested in getting a copy fo the Cosworth document that you have extracted the 2 pages from if possible.

Cheers

V
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PostPost by: elj221c » Wed Jan 04, 2012 11:07 am

Vaughan,

Here are the other three pages and a cover sheet. You should be able to 'save as' but if you can't save them from here I will email them.

The handwritten notes are mine. The cover sheet is from '82 when I bought a piston ring set from them. (?44 including post and packing!) The spec sheets are dated '75 by the looks.
Attachments
CosworthMk12.jpg and
CosworthMk12.1.jpg and
CosworthMk12.2.jpg and
CosworthMk12.5.jpg and
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PostPost by: SJ Lambert » Tue Jun 10, 2014 8:04 am

Image
photo storage

Just starting routing the hoses and fittings......
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