fd rotor housing in my engine?
04-10-04, 01:52 PM
#1
FC Mobsta
Thread Starter
fd rotor housing in my engine?
Has anyone used a FC s4 13BT rotor housing with a fd rotor housing? I know the plug holes a bit different from s4 to s5, but BDC seemed to have 0 problems running 400rwhp with s4/s5 housing mix. Can I do it safely?
-Marc
-Marc
04-10-04, 08:33 PM
#4
Basically, all rotorhousings are the same thing, after 85. 87-91 t2 housings had the coolant passage on the LIM, but that can be blocked off with a plug easily enough. The only other differences are exhaust diffusers (86-91 NA's) that can be cut out with a torch or grinder, and plug timing (between s4 and s5+).
Me personally, I wouldnt mix the housings with different plug timing, but I doubt you'd EVER see a problem if you did. I do mix and match housings sometimes, especially for my own engines. For example, my FD is running 2 s5 NA housings with the diffusers cut out of the exhaust. My t2 vert is running 2 s4 NA rotorhousings, and the turbo's coolant feed is pulled from another spot. I have also built many a t2 engine with an NA front housing, because you don't need that coolant port there anyway...if I dont have a good t2 housing, this is a good way to build a good engine on a low budget.
The FD housing is just an s5 NA housing with no exhaust port diffuser, really.
Me personally, I wouldnt mix the housings with different plug timing, but I doubt you'd EVER see a problem if you did. I do mix and match housings sometimes, especially for my own engines. For example, my FD is running 2 s5 NA housings with the diffusers cut out of the exhaust. My t2 vert is running 2 s4 NA rotorhousings, and the turbo's coolant feed is pulled from another spot. I have also built many a t2 engine with an NA front housing, because you don't need that coolant port there anyway...if I dont have a good t2 housing, this is a good way to build a good engine on a low budget.
The FD housing is just an s5 NA housing with no exhaust port diffuser, really.
04-10-04, 08:38 PM
#5
no really... gimmearotary
Join Date: Aug 2003
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hey kevin hows it goin? i tryed callin ya up a bit ago but just got message. yea i heard ya gotcha a FD...nice. ive been looking for your old name, the one that started with an H. oh well take it easy man.
ps. sorry about the off topic post!
ps. sorry about the off topic post!
05-31-04, 11:03 AM
#6
Older than Dirt
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I know this one is old. So a FD housing is the same as an S5 without the difusser or the same as a tii without the water port. So for an s5 na the best setup should be fd hosings, right?
05-31-04, 01:41 PM
#7
There is no advantage one way or another, though I imagine FD housings are coated better and last longer than s5 housings (in the same way s5 housings are coated better than s4's). That, and the lack of exhaust diffusers...but I cut those out with a torch anyway, so it is no big deal. So yes, I suppose you could say that FD housings would be best.
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