http://marcosforum.org/topic/4428/t/mantula-3-9-exhaust-manifold-.html en-us Copyright 2006, Kickapps feeds@kickapps.com (FeedMaster) webmaster@kickapps.com (WebMaster) Thu, 18 Jun 2009 17:51:59 GMT Thu, 02 Jul 2009 00:01:48 GMT Kickapps Feeds 1.0 http://blogs.law.harvard.edu/tech/rss 60 {pics-1.1 "http://www.icra.org/ratingsv02.html" l gen true for "http://kickapps.com" r (nz 1 vz 1 lz 1 oz 1 cz 1 ) "http://www.rsac.org/ratingsv01.html" l gen true for "http://kickapps.com" r (n 0 s 0 v 0 l 0 )) Search Domain q http://kickapps.com/search/direct/ http://marcosforum.org/reply/22650/t/mantula-3-9-exhaust-manifold-.html#reply-22650
I hear H connectors between the manifolds tend to soften the exhaust note more then they improve performance, and kissing curves must be made the hard way if they don't decrease the net area and hence cause a constriction, but would definitely use one if racing. If you are going for this then you might start the turn in the end of the manifold - or at least immediately after it.

Steve
]]> feeds@kickapps.com (OldNoccer) http://marcosforum.org/reply/22650 Thu, 02 Jul 2009 00:01:47 PST http://marcosforum.org/reply/22635/t/mantula-3-9-exhaust-manifold-.html#reply-22635 I'm a bit biased because I designed and built the web site (still work in progress) but I can genuinely recommend the guy as I didn't know him before doing his web site but knew of the company. He has years of experience and works on mostly older cars including recently a nice AC 427 although he'll happily work on anything. And, like I said, he has the jigs made up for the Mantula manifolds from doing mine. He really is a perfectionist and I think a lot of people would be pleasantly surprised at his prices, although I hastily cover myself by suggesting you talk to him to discuss individual requirements. He has a fair bit of experience with Marcos too as it was he who built the system for the demo TS500 and a batch job for Marcos back in the '90s which is best... err... left alone... (they didn't pay him...). ]]> feeds@kickapps.com (paulo) http://marcosforum.org/reply/22635 Wed, 01 Jul 2009 11:27:06 PST http://marcosforum.org/reply/22618/t/mantula-3-9-exhaust-manifold-.html#reply-22618 feeds@kickapps.com (Jack) http://marcosforum.org/reply/22618 Tue, 30 Jun 2009 17:52:52 PST http://marcosforum.org/reply/22610/t/mantula-3-9-exhaust-manifold-.html#reply-22610 www.torquetechnique.co.uk. ]]> feeds@kickapps.com (paulo) http://marcosforum.org/reply/22610 Tue, 30 Jun 2009 11:41:39 PST http://marcosforum.org/reply/22502/t/mantula-3-9-exhaust-manifold-.html#reply-22502
Interesting graphs, looking at the AFR and torque curve highlights when the mixture richens at cruising rpm 2500 - 3000 the torque curve dips. Like you say maybe in the mapping, after that the AFR is good at between 12.5 - 13.5 which is good for optimum power. ]]> feeds@kickapps.com (dparslow) http://marcosforum.org/reply/22502 Mon, 22 Jun 2009 10:36:28 PST http://marcosforum.org/reply/22499/t/mantula-3-9-exhaust-manifold-.html#reply-22499
JP were quoting me £500 + vat / side to supply and fit in stainless a couple of weeks ago.

cheers,

andrew ]]> feeds@kickapps.com (waldflote8) http://marcosforum.org/reply/22499 Mon, 22 Jun 2009 08:06:46 PST http://marcosforum.org/reply/22476/t/mantula-3-9-exhaust-manifold-.html#reply-22476
Anyway it would be interesting to see how a new pair of manifolds affect these results that we got from a few power runs not too long ago.





These point to a very healthy V8 (apart from the random riching off of the lambda at 2750 rpm every run which is a bit weird but we are putting down do something in the map itself) but gains are there to be had we will take them.

joe ]]> feeds@kickapps.com (jomeo69) http://marcosforum.org/reply/22476 Fri, 19 Jun 2009 17:51:18 PST http://marcosforum.org/reply/22465/t/mantula-3-9-exhaust-manifold-.html#reply-22465 jomeo69 wrote:

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Has anyone had any experience buying exhaust manifolds from anyone other than Rory.
Im pretty sure the £320 they quoted for a mild steel manifold (Just the drivers side one) is a bit excessive???
If anyone has a company they could suggest maybe nearer south east would also be handy???
Cheers guys.
Joe Joe, this topic has been discussed many times before somewhere, for not that much more you can get a pair of manifolds made at JP Exhausts in Macclesfield. They have made quite a few manifolds for members of the forum so they have got the jigs for our cars and their customer service is excellent.
I posted a dyno plot of NCM 109H after I changed the manifolds and exhaust, the results were very impressive and the power/torque improvement for the cost was probably the best engine mod so far.
]]> feeds@kickapps.com (dparslow) http://marcosforum.org/reply/22465 Fri, 19 Jun 2009 10:59:47 PST http://marcosforum.org/reply/22455/t/mantula-3-9-exhaust-manifold-.html#reply-22455 feeds@kickapps.com (Jack) http://marcosforum.org/reply/22455 Thu, 18 Jun 2009 20:51:12 PST http://marcosforum.org/reply/22452/t/mantula-3-9-exhaust-manifold-.html#reply-22452
Steve
]]> feeds@kickapps.com (OldNoccer) http://marcosforum.org/reply/22452 Thu, 18 Jun 2009 20:32:08 PST http://marcosforum.org/topic/4428/t/mantula-3-9-exhaust-manifold-.html Im pretty sure the £320 they quoted for a mild steel manifold (Just the drivers side one) is a bit excessive???
If anyone has a company they could suggest maybe nearer south east would also be handy???
Cheers guys.
Joe ]]> feeds@kickapps.com (jomeo69) http://marcosforum.org/topic/4428 Thu, 18 Jun 2009 17:51:59 PST