Exhaust Baffles

[stevieturbo]

one eyed mick said:

Its common sense[?]realy you are limiting the amount of gas coming out so it will be quiter but will loose power , possibly rpm and may cause over heating ! do you want that ?

how is it common sense ?

You're assuming that the system in place is actually restrictive for the engine in question.
Which when it is a relatively small capacity V6...so only 1/2 overall airflow going out each exhaust. Which if say 250hp is only 125hp, It isnt going to need a 6" drainpipe out the side of each car to be free flowing.

[one eyed mick]

stevieturbo said:

one eyed mick said:

Its common sense[?]realy you are limiting the amount of gas coming out so it will be quiter but will loose power , possibly rpm and may cause over heating ! do you want that ?

how is it common sense ?

You're assuming that the system in place is actually restrictive for the engine in question.
Which when it is a relatively small capacity V6...so only 1/2 overall airflow going out each exhaust. Which if say 250hp is only 125hp, It isnt going to need a 6" drainpipe out the side of each car to be free flowing.

only going on past experience trying to get rally cars past noise meters and wondering were the power went and why it was o/heating , it also happened with flatenned exhaust on rally cars only true free flow is no pipes at all, but can't be done . but may be you guys a clever than my self with only 50 years experience ! To op put bigger pair of boxes on either dia,length or best both

[stevieturbo]

one eyed mick said:

only going on past experience trying to get rally cars past noise meters and wondering were the power went and why it was o/heating , it also happened with flatenned exhaust on rally cars only true free flow is no pipes at all, but can't be done . but may be you guys a clever than my self with only 50 years experience ! To op put bigger pair of boxes on either dia,length or best both

You cant put tuning or build related problems down to an exhaust that is slightly smaller than you might like.

A slightly restrictive exhaust is most certainly not a cause for overheating...if it was, then the majority of standard factory cars would overheat at all times ? Clearly that doesnt happen

But it comes back to the same thing. Assuming exhaust is too small as opposed to knowing.

And you say true free flow is no pipes at all, however that is on total contradiction to actual proper exhaust tuning where pulse tuning and scavenging take place. So some pipes do in fact offer benefits to flow over no pipe at all in many cases.

So true free flow would be deemed a well designed exhaust manifold and system. Not no pipes at all.

[CrutyRammers]

one eyed mick said:

Its common sense[?]realy you are limiting the amount of gas coming out so it will be quiter but will loose power , possibly rpm and may cause over heating ! do you want that ?

Well, both types of baffles will cause a restriction, because both have a smaller pipe; what's not clear to me is if one design is better than another. Which is why I was asking if anyone knew for sure.

I can't have a longer can, because it's a side pipe and the wheel arch is in the way. And as for diameter...they are huge already (6 inches), it'd be ridiculous to have them any larger, you'd never be able to step over them! Having the cats in there is taking up a fair bit of the length, but I'm stuck with that.

Short of remanufacturing the exhausts, which is going to be very expensive and time consuming (again), all I can do is bung them up really. I'd rather get it on the road than spend another 3 months and a thousand quid playing with the silencers. So bungs it'll have to be, they can come out after, and I'll make / modify some smaller ones for track days.

[CrutyRammers]

stevieturbo said:

how is it common sense ?

You're assuming that the system in place is actually restrictive for the engine in question.
Which when it is a relatively small capacity V6...so only 1/2 overall airflow going out each exhaust. Which if say 250hp is only 125hp, It isnt going to need a 6" drainpipe out the side of each car to be free flowing.

It seems to be sized about right according to the rules of thumb I've seen. 280bhp, so 140 per side, seems to require about a 2 inch pipe, so 47mm should be about there.