Charles' early 92 827 manual coupe

[scoobyh123]

Baffles are a no-no, what size pipe has he used for the system?

[Charles827si]

Baffles are a no-no, what size pipe has he used for the system?

I've only just had chance to reply. I'm not sure of the size but I did ask for it to be quieter yesterday, (the day it was made up) The pipe doesn't look much bigger than before quite honestly. (not like a boy racer big drainpipe)

Having had a day to get used the exhaust, I think I'll have to have the back box redone at some point. I'm not keen on the drone noise and actually thinking back to how it was before, the acceleration was better previously.

[scoobyh123]

I'm going to make a guess he's used bigger than 2" diameter pipe. If so, that will make it drone, gutlesss, noisy and thirsty.

The 827 is a funny animal but like all Honda engines that it shares engine-DNA with, they need a smaller bore pipe with no baffles.

[Charles827si]

I'm going to make a guess he's used bigger than 2" diameter pipe. If so, that will make it drone, gutlesss, noisy and thirsty.

The 827 is a funny animal but like all Honda engines that it shares engine-DNA with, they need a smaller bore pipe with no baffles.

That's the reason that I had the MK1 stainless exhaust made to the exact same specifications as the mild steel one that it replaced, and as you would expect it is just fine with no problems.
My fault for not considering better this time around but you live and learn I guess.

[scoobyh123]

First thing to do is find out what size pipe he's used Charles - we may be barking up the wrong tree.
If he's used too large a diameter, maybe he's got a restrictor he could add to the inlet of the back box but if he's used baffles, he wants shooting!

[Charles827si]

First thing to do is find out what size pipe he's used Charles - we may be barking up the wrong tree.
If he's used too large a diameter, maybe he's got a restrictor he could add to the inlet of the back box but if he's used baffles, he wants shooting!

I'll call in at the weekend.

[scoobyh123]

If you've got a digital vernier or similar you could save yourself a trip and measure it yourself Charles.

[Charles827si]

If you've got a digital vernier or similar you could save yourself a trip and measure it yourself Charles.

Been having login 'in' issues for the past 10 mins. From my mobile it says I'm already signed in, so when I come to write a post, it asks me to login and then immediately after login in, it asks to login in again when I can see at the bottom of the page I'm already logged in!
So now I'm on my lap top and having seen that I had obviously logged off from this device last time, I've logged in on the laptop now!

Anyway...………………………………………………….what I was wanting to say is yes I need to check with a vernier (that thought crossed my mind Dave).
But also I was not given an invoice and all I have is a debit card receipt so I need to get one written out so I can see the work involved, labour and materials. Really this is a given requirement but I think alot is laziness when business' don't do this or can not write an invoice properly.

[scoobyh123]

I had a few log-in problems last night as well Charles - gave up in the end!

Once we know the size of that exhaust then we can work out a solution.

That Bluetooth handsfree thing landed the day before yesterday, just been trying it out indoors using the hi-fi as the radio and a USB charger (computer) and so far so good. The acid test will be when i get it in the car and try it.

[Charles827si]

I had a few log-in problems last night as well Charles - gave up in the end!

Once we know the size of that exhaust then we can work out a solution.

That Bluetooth handsfree thing landed the day before yesterday, just been trying it out indoors using the hi-fi as the radio and a USB charger (computer) and so far so good. The acid test will be when i get it in the car and try it.

That's good news on the gadget Dave! I've been to see Tony who built the exhaust today, and I've got a reasonable looking invoice to show for it now.
He told me the exhaust is 1mm bigger and that he says was to allow for the manifolds that were 1mm larger than the old ones that were replaced so that was the reason he couldn't drop the size back to the original exhaust bore size starting from where the end meets the manifold.
So the manifolds are more the problem and particularly due to the sound which now almost sounds like a flat 6 engine.

I have thought about buying a cheap new old stock exhaust to replace this one, but then I guess the end would need to be modified where it fixes onto the manifold header end.

[scoobyh123]

The Bluetooth gadget works well in both the Volvo and the Sterling Charles although i haven't tried it on handsfree calling yet.

As for what Tony said - cowshed confetti!

He's either mixing his sizes up or is trying to baffle you with science.

For a start, 1mm bigger than what? Pipe sizes go up in 1/8" size increments which is about 3.2mm. However, as most things are done in metric these days, you'd be looking at 47/48mm for the system if he's done it the same size or 1mm larger. However..................

...............the front pipe O/D is bigger - 2 1/4" or 57mm which is a full 10mm bigger than the original system O/D which only sounds like 20% bigger at first but when you consider the wall thickness of the pipe is 1.5/1.6mm (now you see why pipe sizes go up in 3.0/3.2mm or 1/8" steps), the I/D would be 44/45mm of the OE system and 54mm I/D of the original front pipe.

The bug bear here is the OE front pipe is twin-walled and the internal is about 2" - i've never measured it so can't be sure. If he's just measured the O/D and fitted a 2 1/4" system, that's why it's flat. Also the baffles in the back box won't help.

I think you need to get your verniers out and measure the O/D of the system he's built, that's the only way you'll get a definite answer.

You also have a decat pipe already fitted, or you did have? That should allow a standard system to mate to the new front pipes but until you actually measure the pipe on the system, we're kind of against a brick wall.

[Charles827si]

A week later, I think this exhaust has quietened down a fraction since it's probably built up a thin layer of soot.
But it still doesn't sound right for an 827 and it's still no more powerful than standard.

One thing I have done yesterday hoping to eek some power is replacing the EGR with a brand new spare one.

There is a slight difference now to how the car performs but I think the true benefit is outweighed by the backbox which has strangled any gains of power or acceleration.

[scoobyh123]

I think you've just got used to the roar of it!

have you measured the outer diameter of the system with your verniers yet?

I was discussing this earlier today with someone who has also owned a manual 827 and played with exhausts etc on them and he's of the same opinion as me - Honda engines love narrow bore pipes and no baffles. He added maybe one or two baffles in the back box if you're careful about placement but as a general rule, we both agreed - no baffles and no larger than 2" O/D system.

[Charles827si]

I think you've just got used to the roar of it!

have you measured the outer diameter of the system with your verniers yet?

I was discussing this earlier today with someone who has also owned a manual 827 and played with exhausts etc on them and he's of the same opinion as me - Honda engines love narrow bore pipes and no baffles. He added maybe one or two baffles in the back box if you're careful about placement but as a general rule, we both agreed - no baffles and no larger than 2" O/D system.

I haven't measured anything yet because I'm hoping to borrow my dads digital vernier when he remembers.
I don't think I have one in my mini toolbox containing various tools I don't really use.

[scoobyh123]

Alternatively wrap a bit of string round the pipe then measure where it meets itself, divide by 3.1416 and that will be close enough to the diameter.