Lotus Elan

Sprint Dyno results with QED 420 cams and Ported Head

PostPost by: mark030358 » Thu Mar 17, 2011 11:59 pm

Well, got my engine dyno results off Paul Exon after fitting the QED 420 cams and having the head ported. And I'm very please with the results.





Mark
72 Sprint
69 S4
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Paul Exon Dyno Test
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PostPost by: paddy » Fri Mar 18, 2011 9:07 am

mark030358 wrote:Well, got my engine dyno results off Paul Exon after fitting the QED 420 cams and having the head ported. And I'm very please with the results.


Looks very good to my untrained eye.

What exhaust was that running?

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PostPost by: mark030358 » Fri Mar 18, 2011 10:25 am

Hi there,
Its a standard two piece four into 2 into 1, with a 35mm bore. Looks like the standard one. Bought from PM's about 5 years ago.

From the spread sheet it achieved its max torque at 5400rpm which was just above 135 lbs/ft. While a max power 150.4 bhp came at 6300rpm.

Well please.... all thanks to Mr, Exon.

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PostPost by: paddy » Fri Mar 18, 2011 10:33 am

mark030358 wrote:Its a standard two piece four into 2 into 1, with a 35mm bore. Looks like the standard one. Bought from PM's about 5 years ago.


Interesting, having to mess around with huge manifold and exhaust always put me off doing anything like that ...

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PostPost by: mark030358 » Fri Mar 18, 2011 11:05 am

Paddy,
Here is a picture.

cheers

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PostPost by: paddy » Fri Mar 18, 2011 11:10 am

mark030358 wrote:Here is a picture.


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PostPost by: gjz30075 » Fri Mar 18, 2011 12:39 pm

Mark, is this a standard stroke engine?

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PostPost by: mark030358 » Fri Mar 18, 2011 1:28 pm

Standard Sprint engine with just the head and cam modifications, plus the larger bore manifold. Re jetted to suit.


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PostPost by: jono » Fri Mar 18, 2011 2:05 pm

...mmm very nice. You don't fancy getting Paul to fit Jenvey tb's and engine management then :D

..is it well mannered?
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PostPost by: msd1107 » Fri Mar 18, 2011 6:44 pm

Very impressive results for a standard displacement Sprint twinc.

150.4 HP @ 6300 is 199 psi bmep (13.7 bar)
135 ft-lbs torque is 214 psi bmep (14.75 bar)

It used to be that full out racing engines would be happy with those bmeps.

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PostPost by: mark030358 » Fri Mar 18, 2011 7:46 pm

The bore is actyally +30... over standard.

The only size QED had when the engine was rebuilt 5 to 6 years ago.

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PostPost by: mark030358 » Fri Mar 18, 2011 8:55 pm

and here it is on You Tube...

http://www.youtube.com/watch?v=ssd9sLpYi0s
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PostPost by: Robbie693 » Sat Mar 19, 2011 4:53 pm

Blimey - That sounds savage!

Very nice

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PostPost by: adigra » Wed Mar 23, 2011 12:18 am

Paul did my engine too, and it's quite similar. Mine was a regular S/E engine, but ended up with 145HP at 6750 with a slightly more even spread of torque.

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