Quote:
Originally Posted by fredio54
this car :
has its runners merge in firing order.
i dislike that manifold for a number of reasons, however, yes, there is a small scavenging advantage from having the cylinders ordered like that as compared to my non ordered approach.
there is not going to be a significant spool advantage simply because of the fact that its the energy that the waves carry that causes the turbo to spin. the only effect that doing that will have is to leave the cylinder slightly more empty and thus with more room for new mix. it would be fully marginal though, and would be offset by the loss from the turbulence of the short radius bends, and the fact that different cylinders have significantly different paths to follow to the merge point.
in mine, all paths are precisely equal. the only variations are from the order of the sections that the gas moves through (2&3 hit a radius before a straight, and 1&4 hit a straight before the radius etc) and the small cock up i had with number three runner meaning its about 4mm shorter on the inside radius and about the same as the other one on the outside radius.
i then suggested that we make it a case of beer and give it a whirl when i get back. the response i got was this :
to which i responded :
TBC... |
well the above is a multi record holding car with mid seven second passes down. and if ya so certain take my challenge! its not my favourite manifold eithe but its a clear example eriks and 50 killers are pulsed the same and others