QED 420 MOP Setup Recommendations

[1owner69Elan]

From those who have Dave Vegher built engines I would be interested to know what timing he used on your cams and what cams he used as i have not seen data from his recommendations

cheers
Rohan

Specifications on my Dave Vegher 1700 twincam. This engine was built for the street, not like most of Dave's race motors.

Cams:
Kent brand. I don't know the part number. (I believe these were recommended by Tony Ingram as a good high performance street cam)
0.44" lift
Duration: 250 deg @ .050" lift
MOP: 105 on the intake, 107 on the exhaust
Valves:
Intake: 1.625"
Exhaust: 1.375"
Carbs:
Weber 40's
32 mm chokes
Airbox: Oversize custom Weber box with cold air trunking (Standard airbox robbed 7 hp)
Exhaust: TTR Extra Large Bore Race System
Head: SAS new Weber casting. Street ports, although Dave increased these, as well as other head "tweaks", from as delivered.
CR: 10.3 : 1
Pump gas (91 octane, (R+M)/2

Result: 181 hp @6900 / 143 lb-ft @ 5100
Torque relatively flat, shown on dyno.

[rgh0]

Thanks for that data. That Kent cam is very similar to the McCoy .44 lift cam i have used with similar MOP timing. While seat to seat duration and total lift are not the total determinants of a cams performance they tell you 70% of what it will be like. Duration for lift at .050 inch and 0.200 inch lift checking points tell you a bit more and area under the lift curve ( inch degrees) at these points tells you a bit more.

cheers
Rohan

[Pfreen]

Wow 1owner69elan!

That is one impressive engine. I’ll bet 99% of twincam owners who want a street engine are jealous. I am.

[knockoffnut]

it makes sense to set the cams for more lower end torque for a road application. When I built my twincam for my S3 Elan I played around changing offset dowels until I found a cam position that gave me a nice amount of low end torque and still lots of high end power, but as it was a road engine I definitely wanted the driveability of the low end torque. My point is it is easy (and fun ) to try different cam settings after the engine is built, and "trust your bum"... if it feels right then it is right.

[vstibbard]

My experience back in the 80's with my S4SE DHC (MJY740J) which was delivered from factory with the Stromberg head with big valves and D types (Sprint) cams, I had Ed Winter rebuild and port the head and Ken Snailham (WED) built up the bottom end and ran engine in dyno, then did final set up, it had 10.3:1 comp, with some tweaking of timing and bob weight springs, richer needles, it had twin muffler exhaust, this engine produced 128bhp with similar torque to a Sprint.

Only element missing was the carb sound!!

On balance I had performance and when touring in France to LE Mans's and Med I'd get 40miles/gallon and on motorways mid to high 30's!!

[Billmack]

There is really no substitute for running your actual motor on the dyno. A few days of testing scientifically managed will tell you a lot. Of course you can also wear out your engine a lot.
Had an elan come and go in my shop with one high lift cam on the intake side and a sprint like cam on the exhaust. Really nice running engine for street use. I' m told it did something in the 150's on the dyno a couple rebuilds ago. I was impressed with the tractability and how it really flew out of a corner.

[seniorchristo]

I'm confused.

Artificial Intelligence tells me: "To increase torque on the lower end of the IC engine, you typically advance the valve timing. This means moving the maximum opening point of the intake valve earlier in the engine cycle."

If I move my MOP from 110 and to 105, is this considered "advancing the intake valve timing"?

From earlier discussions here the lower number seems more in line with high rpm power. Can someone clarify this?

Thanks
Chris

[rgh0]

AI is talking about a single cam V8 as that is all it knows or cares about based on volume of web publications and it does not understand engineering with a fix lobe angle so only the whole thing can be advanced or retarded not the inlet and exhaust individually as in a Twincam.

[seniorchristo]

Just as a general rule of thumb and not specific to any particular engine:

Would moving the MOP on the intake valve from 110 to 112 increase low end torque and would this be considered advancing or retarding the MOP?