The page states "The standard exhaust port on a p200 is approx 39mm wide (when measured straight accross)". My question is how exactly is the exhaust port measured to get the 39mm dimension?
I did a paper and pencil port map and get a measurement of 36.5mm when measured straight across when the map is in cylindercial form, and when the map is laid flat I get the 39mm dimension.
Am I just confused by the "when measured straight across" statment?
Thanks.
Re: P200 mild exhaust porting question
Posted: Sun Nov 14, 2010 5:52 pm
by H,POOL GADGE
stay with your port rubbing 39mm, and take port sides out 1.5mm, nice little tweek!!!!
Re: P200 mild exhaust porting question
Posted: Mon Nov 15, 2010 4:26 pm
by Bofs
A set of these are handy for measuring the port size, straight across, in conjunction with a digital vernier
Re: P200 mild exhaust porting question
Posted: Mon Nov 15, 2010 5:32 pm
by guygrrr
Bofs wrote:A set of these are handy for measuring the port size, straight across, in conjunction with a digital vernier
i'll do a +1 on that.
Re: P200 mild exhaust porting question
Posted: Mon Nov 15, 2010 9:08 pm
by shamrockexpress
Bofs wrote:A set of these are handy for measuring the port size, straight across, in conjunction with a digital vernier
Is that the tool you got to measure the HOOP!!! on your mod mates
Re: P200 mild exhaust porting question
Posted: Tue Nov 16, 2010 3:50 pm
by Steve
Bofs wrote:A set of these are handy for measuring the port size, straight across, in conjunction with a digital vernier
I do have both the spring caliper and a digital vernier gage.
But I am still confused about the measurement of my exhaust port. Is the exhaust bore width of approx. 36.5mm on my '79 P200E the stock size? Maybe there is a listing of the stock barrel specs somewhere on this formum or out on the net but I can't seem to locate it. Does anyone know the stock barrel dimensions or mapping for a stock barrel?
Thanks
Re: P200 mild exhaust porting question
Posted: Wed Nov 17, 2010 3:03 pm
by jonny snatchsniffer
run a square down the barrel to the edge of the port both sides and mark at the top of the barrel and measure what you have, my 57mm bore parma is around 39 @70% but i wouldnt go above 65% with wanky p2 rings so about 43/44mm should do ya, just reverse the above process to mark the port width in the barrel and dremmel away, easier with the stub out
