Join Date: Sep 2000
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Re: New Flowmaster Y and high flow 3\" cat on !
WD-40 and all, thanks again for the photos, advice and inspiration
I've already got digital photo's, just don't know how to post em'. The header flanges were a snap. Welded them onto both sides of the 3" cat and to the 3" to 2 1/2" to 2 1/4" reducer cone I made up. The only flange i didn't weld up before hand was the one that went on the end of the flowmaster 2 into 1 Y pipe. That we welded on, once the two head pipes were bent up and located inside the Flowmaster Y pipe.
Norm, I patterned it more ot less from WD-40s set up, though it does vary a little, with the header flanges for quick removal of part or all of the system from the 2 into 1 collector and further back. We used ridiculously heavy guage tubing, dang near 1/8" ! Had some ticking today, so we snugged up the brass nuts holding on the manifold flanges, if it happens again I'll have to go back to steel nuts on those manifold studs.
Really nice entry angle on the passenger's side into the Flowmaster Y pipe, minor kink passing under the oil pan from the driver's side though not bad, and considering the pipe is now fully 2 1/4" instead of under 2", that's an improvement right there. Major improvement (like WD-40's) by getting rid of that huge vertical "S" bend that went up, from the first stock cat, and over the crossmember to the second stock cat further back. This improves not only flow, but ground clearance on the exhaust. By using only one new style 3 way cat we were able to make a straight run off the manifolds and over the crossmember towards the new cat(again, just like WD-40's system). This was a problem on all 5 litre equipped 4X4 Ford trucks, as well as Broncos, I'm told.
It's been mighty cool here for the last week, but even considering that, mileage appears to be up a solid 2 mpg over the last tankful. This is great considering I've been "on it" a lot testing out the set up whenever possible. I'll get back to normal driving and keep you all posted on the mileage improvement. Tomorrow the high is only going to be -17 Celcius here so i ain't expecting miracles. [img]images/graemlins/burnout.gif[/img] [img]images/graemlins/burnout.gif[/img]
You were asking about header flange locations ? My buddy is an artist, he was able to locate the high flow cat so both header flanges are either side of the crossmember and totally accessible from underneath !