Manifolds

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impster
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Manifolds

Post by impster » Tue Mar 30, 2010 3:23 pm

I have been offered one of these manifolds at a reasonable price for my rally Imp but wanted to see some of your worthy opinions before I decide to part with my cash, can anyone see anything that will hold the engine back or not let it breath properly, or anything else come to that?

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benwick3
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Re: Manifolds

Post by benwick3 » Tue Mar 30, 2010 3:26 pm

Look fine to me. Should work OK. What's the price?

Pete Richards
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impster
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Re: Manifolds

Post by impster » Tue Mar 30, 2010 3:34 pm

Under negotiation at the moment, there may be more of these available!
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skamanfrank
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Re: Manifolds

Post by skamanfrank » Tue Mar 30, 2010 3:59 pm

I assume it's my eyes deceiving me, but are the secondaries different diametres?
I think it's just the way the photos taken to be fair
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impster
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Re: Manifolds

Post by impster » Tue Mar 30, 2010 4:12 pm

I can see how you thought that, but no, they are the same.

I am concerned about where the two initial paipes meet the secondary and again the secondary to the final, they just seem a little short and not flowing and I wonder what effect this would have?

Thanks
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benwick3
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Re: Manifolds

Post by benwick3 » Tue Mar 30, 2010 4:59 pm

I have something very similar on the car at the moment with no problems. As I've said before I've tried virtually all the twin sidedraught manifolds over the years and quite honestly I haven't found any noticeable difference. You may be able to measure differences on the dyno but it's beyond me to notice any difference in real use.

Pete Richards
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Clive Brown
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Re: Manifolds

Post by Clive Brown » Tue Mar 30, 2010 6:36 pm

That looks OK to me; that's the Works/Janspeed pattern of 4-2-1 that George Bevan preferred, and I used whenever possible.
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brakedisc
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Re: Manifolds

Post by brakedisc » Tue Mar 30, 2010 7:08 pm

What diameter are the pipe lengths? Inlet head to carb and primary exhaust and secondary exhaust. What are the diameters? Looks very good and I am sure there would be a big market if they could be produced at a reasonable price. I am studying the Millington book at the moment and there are lots of thoughts re exhausts in there. Like Peter said unless you have a dyno it would be hard to judge the various types.
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Turboimp
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Re: Manifolds

Post by Turboimp » Tue Mar 30, 2010 7:18 pm

Are these around £500? I'm awaiting delivery of something similar in exhaust only form ...
How are you going to protect it ? You cant just run it naked or it wont last many years ... unless you are racing of course , i do 15000 Imp / Clan miles a year
I'm getting mine shot blasted and treated with cermakrome from demon tweeks , the aerosol VHT paints dont last or protect at all .
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impster
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Re: Manifolds

Post by impster » Wed Mar 31, 2010 11:03 am

Haven't got that far yet, I think i'm going to give it a go, they are brand new £600 all in. I think that's a bargain considering i have seen second hand Janspeeds going for more!

There may be more available, PM me and I'll pass you the details!
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colin rooney
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Re: Manifolds

Post by colin rooney » Wed Mar 31, 2010 12:11 pm

try stuar brownsey at http://www.rodwellmotorsport.com/ he does a cracking manifold

col
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ImpManiac
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Re: Manifolds

Post by ImpManiac » Wed Mar 31, 2010 8:10 pm

So does Mark Maynard too. £450 for a combined one, IIRC. See! Manifolds are everywhere! :wink:

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cov_climax
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Re: Manifolds

Post by cov_climax » Fri Apr 02, 2010 11:43 am

does anyone know if the above suppliers make large bore exhaust only manifolds? - should be cheaper to make than combined, and i'm on the look-out for a reasonably priced one :D
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Turboimp
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Re: Manifolds

Post by Turboimp » Fri Apr 02, 2010 11:51 am

Try Mark Maynard for the separate big bore exhaust manifold 01453 833185 it wont be half the price of a combined manifold but approx 75% of the cost i would think .. ask him ...
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