FrankR
Web Wheeler
Reged: 02/01/04
Posts: 10225
Loc: Columbia, SC
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Re: Bob's 3.0L Engine
06/24/07 12:13 PM
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These pictures should show how much care is needed to align an exhaust manifold. There can be (and is in this one) a lot of slop in the bolt pattern that can cause port misalignment and reduce performance. The next 2 pictures show clock movement and the relationship of the gasket to the exhaust ports on the passenger side manifold:
The next two show fore/aft movement:
It's usually best to center the manifold fore/aft and use the lower flange ears as a "feeler" height guide:
After tracing, the pattern looks like this - it's all centered, yet way off and will need quite a bit of grinding:
On installation, the manifold will be centered fore/aft, but lifted a little to expose the step and center the exhaust port on the gasket.
Frank
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'89 G-Raider Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 155k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, 165A alt., Lifeline AGM, Rust-Oleum
Edited by FrankR (06/26/07 09:35 PM)
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