Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 M3W air filter change

MMC stage 1 has square cut exhasut tips whereas the stock are angled.

If you're getting the "gravel" sound (probably starting at about 5,200 rpm) that's pinking and stock exhaust.

As discussed in may threads - drill out the front baffle or swap to MMC Stage 1 or G56 to free up the engine.

For the early models there was a software change to retard ignition at high revs, high load conditions.

I have the SandS stealth muscle air filter fitted and found it helped to smooth out the motor a tad.

I got hold of the updated software from my dealer and uploaded to the ecu myself using the Protune program.

I understand the X-wedge engine has an anti-knock sensor which automatically retards ignition to stop possible pinking (S & S documentation confirms there is one fitted to rear cylinder).

If the issue occurs around an indicated 5200rpm and given inaccuracy of tacho, it could well be the rev limiter cutting in which I can best describe as a misfire sound with associated power hesitancy. Little point in holding onto revs above 5000rpm anyway. Just viewing power/torque curves will confirm that both are tailing off then.

Running the Stealth Muscle cover and it does help with engine reaction time. This engine, with its torque and short rpm range reminds me of a diesel engine which is a massive air pump. You can hear the noise of the air intake. I also understand that the original hockey puck of a cover was modeled to help damp out engine noise to conform to various countries noise laws. It does not help performance.

As Richard Wood stated there is not much point going above 5200rpm. Even there the engine is ragged. I keep mine between 3000 and 4700 rpm. I find the tach to be very accurate compared to the fuel gauge.

Change the pipes to Magnaflow's like I did or a Stage 1 and throw the exhaust pipe wraps away! I also added a little "Spitfire" air scoop to help drive the clean cool air into the engine. The engine gets plenty of clean air now.



[img:center][/img]



High Noon Speed Shop

.....cruising the back roads to Nowhereville....

Again I really feel the factory air filter is really not a problem at all especially when you add an air scoop. Here is my Magnaflow Muffler conversion link. I did this all myself for a little under $300!!

Magnaflow Muffler conversion.....

High Noon Speed Shop

With the stock exhaust the pinking is due to the restricted airflow exiting the cylinders, not the timing.

Hence why the headers glow red after a few minutes and using higher octane fuel or an octane improver makes no difference.

Although I agree the last RPM aren't going to gain you much, the torque/power curves on their own don't tell the full story - it's a combination of gear ratio and torque at the relevant rpm. i.e. if you're really going for it (e.g. circuit racing) you are usually better off holding on to the current gear even if power is dropping off.