se5a Rolling Road Graph

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se5a Rolling Road Graph

Post by housemartin » Mon Dec 18, 2017 9:24 pm

I have been wanting to put the se5a on a rolling road for ages to see how the power outputs of a 40 year old engine and transmission compares to the factory spec. Now I have added stainless exhaust including tubular manifolds and a John wade a K&N filter, but it still has the D port heads and standard compression etc.

Searching the forum has not revealed any other graphs for the Essex V6 so here is my results from today.
SE5a.jpg
SE5a.jpg (165.8 KiB) Viewed 1871 times
The mechanic at the rolling road though I might have fuelling issues with the power dropping off at 4,000 rpm and if that was addressed I might get the factory 120bhp. This graph is after some adjustments of the ignition / balancing the carbs and I am well pleased with how smoothly the engine is now running.

Just wondering if any one else out there has graphs they can share?

Cheers

Dan



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se5a Rolling Road Graph

Post by philhoward » Mon Dec 18, 2017 9:30 pm

Shame it didn’t have the air:fuel ratio plotted on there too.

I have a plot from my 5a, but isn’t an Essex and has an extra 100bhp. I do know mine was running rather rich at the time though..11:1 at max power so plenty more to come.


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se5a Rolling Road Graph

Post by Mr Bridger » Mon Dec 18, 2017 9:55 pm

Very interesting thanks for posting.


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se5a Rolling Road Graph

Post by Oaksey » Mon Dec 18, 2017 11:08 pm

Here's one of mine. I can't find the other which was similar. I've not had it done since the engine was rebuilt this year
5aPower2013_zps41fd535f.jpg
5aPower2013_zps41fd535f.jpg (115.08 KiB) Viewed 1813 times


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se5a Rolling Road Graph

Post by Diyhell » Mon Dec 18, 2017 11:37 pm

Here's one from the Essex I bought that's currently under my workbench awaiting fitting
IMG_20171218_223522.jpg
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SE6a needing lots of work...

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se5a Rolling Road Graph

Post by Nick » Tue Dec 19, 2017 11:17 am

I have seen quite a few and this looks typical if a bit low for a standard Essex. It always surprises me how much is lost in the transmission, but again typical. Generally no point in going over 5000 rpm.

Mildly tuned engines (like mine) with cam changes etc. typical give about 150 bhp.


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se5a Rolling Road Graph

Post by AndyKing » Tue Dec 19, 2017 11:49 am

Here is one from my coupe.

This has fuel injection fitted to an otherwise standard engine.
image.jpeg
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The torque equates to 155.3 lbs.ft, so very similar to the others. It's interesting how similar the torque curve patterns are for all of the graphs.

Andy



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se5a Rolling Road Graph

Post by Nick » Tue Dec 19, 2017 12:22 pm

Andy,

Revs very well for a standard cam. Does the injection use the standard manifold?


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se5a Rolling Road Graph

Post by AndyKing » Tue Dec 19, 2017 12:33 pm

Nick,

It is using a triple weber manifold and Jenveys.

I am only assuming it is standard. I've not had the engine apart any further than replacing the manifold and timing gear. The inlet ports on the head certainly look untouched.

Andy



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se5a Rolling Road Graph

Post by efi_sprintgte » Tue Dec 19, 2017 1:11 pm

I’d be very surprised if that didn’t have a slightly hotter cam then standard in it


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se5a Rolling Road Graph

Post by Joe. » Tue Dec 19, 2017 11:52 pm

Here's one of my 5A from last year, Modified 3.1 Engine, Fuel injected - triple manifold, jenvy throttle bodies, Gas flowed Heads, ( almost certainly limited by air filter & the currently standard midbox silencers.)

Image

Headline figures were 176.4 HP - 225NM of torque on this session.

Love how all the graphs so far (both standard & modified & standard engines) are wonderfully consistant. For all the modifications its still very much an essex!



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se5a Rolling Road Graph

Post by BigBobPilot » Wed Dec 20, 2017 12:54 am

Why does the graph stop at 4250 rpm Dan? It's a long way from the red line unless it's a diesel...

Did the rolling road operator back off because the power dropped off or due to the fuelling? If it's the fuelling it needs sorting so you don't lean it out and start melting pistons. I learned the hard way, in the middle of France in my old Scim.


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se5a Rolling Road Graph

Post by turboscim » Wed Dec 20, 2017 9:03 am

I must learn how to put pics. on here.
The turbo gives the same power curve as normally aspirated but the torque curve is not a curve its almost flat from 3-5000



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se5a Rolling Road Graph

Post by AllingtonGT » Wed Dec 20, 2017 11:00 am

New plot coming.
Last edited by AllingtonGT on Sat Dec 23, 2017 12:46 am, edited 1 time in total.



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se5a Rolling Road Graph

Post by Rev Light » Wed Dec 20, 2017 12:07 pm

Dan,

Thanks for putting up this graph. It seems to imply that if your engine has good compression, with a couple of after market parts, you can still get close to the original power, that we all know was probably never achieved when the car was new.

My car, should be close to this when the engine goes back in.

Cheers

Steve


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