View Full Version : Who has an equal length manifold?

Bob C
18th March 2003, 16:03
Do any of you guys have an equal length manifold fitted to your cars? If so, what do you think to it and has it improved the performance?

I understand that the lub-dub-lub-dub sound of the engine is partly because of the standard unequal length manifold. Do you lose the aural character of the engine if you fit this?

18th March 2003, 18:38
I have one fitted,seem to have lost a bit of low down spool up,but isn't a problem with the type r gearbox,as for the sound i prefer it's more like a mk2 escort on steroids...Alan http://bbs.22b.com/ubb/biggrin.gif

18th March 2003, 22:53
A timely post, I have had an equal length manifold for about a year, it added torque and smoothed the power delivery. It does change the engine note apart from the following I would recommend it if you have already done the usual mods first. Mine now keeps blowing apart under boost since the bars across the joints weren't fitted. http://bbs.22b.com/ubb/mad.gif
Can't get this sorted until the 26th. I have tried wire and springs but these broke, will be trying to rig something up with a coathanger tomorrow to see if it helpsuntil then

19th March 2003, 00:10
My Scoobysport "equal length headers" couldn't hold more than 1.2 bar.

3 rebuilds many months off the road, eventually Croney tried fixing the leaks with exhaust putty.

I would not trust Scooby sport to make me a cup of coffee anymore http://bbs.22b.com/ubb/mad.gif

19th March 2003, 05:22
Why is this in Driving and Handling? http://bbs.22b.com/ubb/smile.gif

I've tried two equal length designs - what you lose in spool up is easily regained else where. But you really need to map around them to realise the full gains.


19th March 2003, 05:58
Shame they didn't work out as your car sounded absolutely fabulous last time I followed you Anders http://bbs.22b.com/ubb/frown.gif (How long ago was that run to the pub in Cantebury???)

19th March 2003, 22:35
2 years http://bbs.22b.com/ubb/mad.gif http://bbs.22b.com/ubb/frown.gif

May go for proper non Scooby sport headers when funds allow at same time as Front mount.

As it is I don't want to be too much of an Adam clone http://bbs.22b.com/ubb/eek.gif http://bbs.22b.com/ubb/wink.gif

20th March 2003, 08:21
As Chuck recalls the Scoobysport headers sounded nice but leaked above 1.2 bar http://bbs.22b.com/ubb/mad.gif

They are for sale on the understanding that the buyer doesn't want to run big boost, i.e. suitable for a car with standard internals.

They have been ceramic coated and have 2 EGT bosses in place.

Adam M
20th March 2003, 09:14
I dont understand this at all.

I took my mrt headers to haywards who made your headers, and ian double sleeve jointed them for me. They didnt leak after that and are still going very very strongly!

I believe pat has just sold them.

Shame they were too small for the 2.5, they were awesome with apparently no downsides!

20th March 2003, 16:49
Intersting point about manifolds.
Some say good, some say bad, but what a lot of people seem to say, is that a lot leak or blow apart!!!
Are they reliable, or do they need constant maintenance, or gasket replacements???

21st March 2003, 19:52
Ah mine aren't scooby sport but the problems are since the boost has gone over 1.2bar. But they should have had bars across the joints. When they blow apart it's an awful shock to the car since it's running at high boost. Is it possible I've done some damage?

24th March 2003, 16:23
Pat has indeed just sold them http://bbs.22b.com/ubb/smile.gif
The sleeve might be hanging together nicely, but they're not equal length anyway, just very spindly looking things!
And they do seem to work quite nicely too...

Adam M
24th March 2003, 16:28
In my experience when most people say equal length headers they actually mean tubular headers.

Very few tubular headers are equal length as the flow from the near bank would have to be seriously convoluted.

Its not impossible, I think I have seen some, although cannot be certain.

Either way, enjoy those mrts. really couldnt fault them once I had had them slip jointed.

one of the best mods I ever bought for the car!

24th March 2003, 19:21
Mine are equal length and yes they are convoluted but they also blow apart if the bars are not fitted over the joints. http://www.powerengineering.co.uk/subaru/products/exhausts.htm

30th March 2003, 18:32
I've got one of these fitted to mine http://godspeed.hack.net/Maximgallery.html and had no prblems with it.
I can't say that it has improved performance as it was on the car when I got it, but it certainly impressed the guys at Well Lane as to how quick it gets up to max power.
It does make the car sound different to a normal scoob on tickover loses the rumble, but with a loud exhaust sounds good to me!!!