OzVMX Forum

Clubroom => Tech Talk => Topic started by: jimson on October 13, 2013, 09:57:19 am

Title: intake manifold
Post by: jimson on October 13, 2013, 09:57:19 am

G,day viewers could some one tell me if extending the manifold between the carbie and barrel would change the performance of the engine? Thanks Jimson

Title: Re: intake manifold
Post by: asasin on October 13, 2013, 10:25:05 am

depends how far , usual rule of thumb long more torque, short more revs . but a little bit wont make 5/8s difference

Title: Re: intake manifold
Post by: SON on October 13, 2013, 10:35:20 am

Which engine

Title: Re: intake manifold
Post by: Iain Cameron on October 13, 2013, 10:46:32 am

I know the spacers on the DT \ RT 1 Yamahas had 2 types an enduro and A scramble . the scramble was about 10mm shorter hence the motor would rev better . Iain

Title: Re: intake manifold
Post by: jimson on October 13, 2013, 10:49:24 am

Minarelli 125 2stroke its in my Indian enduro from 1973

Title: Re: intake manifold
Post by: pancho on October 13, 2013, 11:57:55 am

 14 inches from bellmouth of carby to the valve seat (on a 4/) equals 4000rpm best.

Title: Re: intake manifold
Post by: Lozza on October 13, 2013, 01:33:16 pm

From the front of the carb(bellmouth) to the reed tip is the most important on a reed engine. Disc valves and piston port have another usualy shorter number that works best.