Hi all. Sorry about the long winded thread, but I am looking for some advice. I have just bought a 110 with a V8 from an SD1 fitted. I have noticed that the exhaust has started blowing, and really needs replacing. As the engine has been mildly tuned & fitted with K&N filters, I wanted to fit an exhaust that will get the best out of this engine. One setup I have seen, has each bank of cylinders with its own separate exhaust system running down each side to a single silencer at the back of each exhaust. The advantage of this system is that I can tune each carb individually, as I know from having tuned bikes before, that with carbs, they never run at exactly the same mixture. The problem I may have though, is that this setup was on a sports car, so this setup may not give power and torque characteristics suited to my land rover. The other system I have seen involves the two downpipes going into a collector, before splitting into two separate pipes at the back. I don't know how this will affect the engine perofmance, but it does semm quite a popular setup. The third option would be to go for a standard exhasut, but I think this is quite a restrictive system, and won't make best use of the engine mods, but would be the cheapest and easiest option to fit. I have searched the forum, but can only find threads relating to fuel injected engines, which is a whole different kettle of fish. If anyone has any experience of these exhausts, I would be very grateful for some advice, also if anyone has any ideas I have not thought of, that would be welcome too.

Do a little search mate, or even just flick through the v8 section a few pages, there was a superb thread about v8 exhausts, worth reading!

Mr Noisy said:

Do a little search mate, or even just flick through the v8 section a few pages, there was a superb thread about v8 exhausts, worth reading!

Click to expand...

I did search, but could only find threads relating to the fuel injected ingines, which isn't really applicable to the carb fed engine as the EFI sytem automatically adjusts the fuelling for the exhaust. I will look again though.

Fair point mate, there was some info that might apply, talking about balancer pipes and scavenging being very important on a rover v8.

Not many threads in the v8 section so it can't be more than a few pages back...

because the rover V8 is cross plane crank at low revs exhaust gas flow is slow so it can go back into the cylinder. this is not a problem on flat plane crank. a the use of a balance or Y pipe helps solve this problem.

Mr Noisy said:

Fair point mate, there was some info that might apply, talking about balancer pipes and scavenging being very important on a rover v8.

Not many threads in the v8 section so it can't be more than a few pages back...

Click to expand...

POAH said:

because the rover V8 is cross plane crank at low revs exhaust gas flow is slow so it can go back into the cylinder. this is not a problem on flat plane crank. a the use of a balance or Y pipe helps solve this problem.

Click to expand...

Hi dude

Because exhaust flow rates are slow, does this relate to the very rough burbly sound that my 3.5 makes?

It sounds almost like it's missing on tick over sometimes, and if you hold it at 2000 ish rpm when not fully warm it pops in the headers so loudly it seems like it's missing, but if you feel the motor you can tell it is running smooth.

Some v8s sound rough but modern ones tend to be very smooth.

Just won'drin

Gonna go Wikipedia 'cross plane crank' now!

Cheers

no balance pipe on this

[ame=http://www.youtube.com/watch?v=pKPhT9gPz5Y]Ford Mustang 66, V8 sound - YouTube[/ame]

Mr Noisy said:

Hi dude

Because exhaust flow rates are slow, does this relate to the very rough burbly sound that my 3.5 makes?

It sounds almost like it's missing on tick over sometimes, and if you hold it at 2000 ish rpm when not fully warm it pops in the headers so loudly it seems like it's missing, but if you feel the motor you can tell it is running smooth.

Some v8s sound rough but modern ones tend to be very smooth.

Just won'drin

Gonna go Wikipedia 'cross plane crank' now!

Cheers

Click to expand...

Balance pipe for go, ditch it for show

standard exhaust system has a Y-pipe that brings the two manifolds into one pipe anyway.

Yeah exactly, but it sounds better with the two banks separated, as demonstrated by your video, albeit big block no doubt.

Cheers

I spent a while looking at this for my P6, same carb'd 3.5 V8. In my view from what I found out, the ideal solution for beefing the low end torque is massively complex with, there's a semi-ideal one that's quite complex with crossovers (too complex to fit in the space I have) and a sort of OK one that I'm going for, which is cast Discovery manifolds ( I think) and going 4 into 2 into 1 on both banks, into a single 2 inch pipe then splitting to 2 after that. Rimmers and some other people do 4 into 1 manifolds but I want low end torque not high end power, and they're really expensive.

P6 currently has a single 1.5 inch pipe... I want more noise!

hi mate, just to confirm, an early discovery (pre cat version) has cast 4-2 manifolds, 2-1 downpipes and then a Y collector which goes to the mid box.

later discoveries with cats had single downpipe (for the cats obviously)

cheers

yup, thems the ones, cast 4 into 2 then tubes for 2 into 1. Looked like the easiest and cheapest way to better manifolds, the standard P6 ones don't look that great..