mark5000
05-05-2005, 02:45 PM
I bought a new Os Max .46 VX-M marine engine , and also bought the o.s. max 180 Degree Header, and flywheel, i noticed in the tech notes at tower hobbies for this engine, said to use a tuned pipe larger than the normal .45 ,7.5cc. they said use a 11cc-15cc tuned pipe,or engine falier can result, in the o.s. max,.46 instruction manual it states use a .65-.90 tuned silencer, again the larger pipe than the .45 7.5cc. i talked to manufactureres of the tuned pipe's they said if i use the larger pipe .65-.90. for a .45 engine the larger pipe will not give the performace it was intended to give due to not being matched,if i do use the larger pipe it will stick out of the back of the boat and be huge looking on my 7.5cc boat, why do they say use the larger pipe, and can i use the smaller parather 7.5cc tuned pipe,