RM370 Cylinder head volume ?

[Rossvickicampbell]

I actually hear the new board/director is turning things around???  Maybe a bit of support for them will help us in  the long run?

[micko]

Going for the modern shape and centre spark plug Tomas, hopefully get rid of the dreaded ping !!!

How badly is your bike pinging?

My 370 has a 400 barrel with the 370 head. I set the squish at about 050" and enlarged the combustion chamber slightly more than pro rata to maintain or drop the CR. I run it quite rich and have never heard more than a tiny, momentary ping running in deep sand on a hot day.

Pings like a bitch Momus, always has under hard acceleration. Rideable but shits me - been a problem forever, tried all that ! Long story, problem is no one over here will attempt to weld up old contaminated alloy, plenty places will machine it etc - so I have sent it to the east coast for the modern treatment, let you know how it goes

[LWC82PE]

l reckon the plugs were on an ange so they could be easily accessed with the chamber in nice and tight.

Yeah that reason too but i have also seen a suzuki service bulletin on changes from  A and B models where they said they angled the plug so it could get more air flow.

[pokey]

FWIW the old TS series had two plug locations. both angled but one was closer to centre and more upright.  Ive never had a convincing reason why they had both.(cooler plug or oiled plug or just a spare or even a decom) What i have noted is that the engine ran better,cooler and less pinging with the centre plug. The reasoning i feel is because of the scavenging process of this type of engine. With the flame centralised within the squish band this promotes even burning and lets the squish do its its thing rather than creating hot spots on one side of the CC. I dont see too many plugs angled on modern 2T engines.

[Davey Crocket]

You'll probably find the reason that there are only a few homologated fuels is because the supplier has to pay MA for the privilege.....so they can spend it mostly on Road Racing events.

[pokey]

Where is the like button Wasp? i have a V50 mark I  Moto Guzzi in the garage with conti's and that little bike is an instant trip to Italy sipping espresso in a hillside cafe with a Mona Lisa smile. Bureaucracy kills so many of lifes actual pleasures. Not so sure you could get club reg on a 370 that easy though.

[micko]

Standard RM head

[211]

You'll probably find the reason that there are only a few homologated fuels is because the supplier has to pay MA for the privilege.....so they can spend it mostly on Road Racing events.

that would be wrong......

[pmc57]

Re Pinging in the RM370,

I was reading an old copy of the "Moto-X Fox Guide to Preparing the RM and PE Suzuki for Competition" booklet the other day and noticed a paragraph under Carburetor and Throttle about altering the ignition timing on the RM370 to help stop the "Ping".

It quoted, "On the RM370 you should change the ignition timing from the factory setting of 4.1mm BTDC to 3.8mm BTDC. Retarding the ignition before top dead centre will give the 370 a little more low end power and help prevent detonation which the 370 engine sometimes suffers from".
It also said the carby jetting for the RM370A,B should be 320 main, Q4 needle jet with the clip in the third from top on the needle.

If any or all of these hasn't been done already, they may be worth a shot.

Hope this helps 

[micko]

Thanks mate, help appreciated but been there. Cheers.