Intake manifold / throttle bodies

wstar · 03-31-2009, 02:04 PM

Pg 29 of EM.pdf (from the service manual available on this board) has the exploded diagram for the "Intake Manifold Collector" as they call it, which is the upper air intake plenum and the throttle bodies attached to it. It doesn't appear any coolant is routed into the plenum itself, but you can see the lines that go through the throttle bodies. I've marked them up on this copy of the diagram (C & E are water/heater hose connections to elsewhere):

While the intake air cooling effect of modding this is probably minimal, once someone comes up with a neat little solution for it, it will probably be $3, making it still good bang for the buck. Just need a bypass hose hooking C directly to E, completely remove various soft hoses (6, 7, 15, 16) and possibly the rear hard line that connects 16+7 (if it's not welded to the EVAP hose that runs parallel), and put 4 little caps on the throttle bodies' inlets/outlets.

wstar · 03-31-2009, 02:10 PM

On the plenum side of things, the service manual doesn't say anything about it having an upper and lower half to space apart, I'll have to look on the car itself and see if it's all one piece later. That's also a cheap/easy mod some guys apparently did on 350's for a nice little gain.

wstar · 03-31-2009, 02:46 PM

Ok I looked at the car briefly, that rear little hard line from the earlier diagram is welded to the same mount as the evap line, so I guess it stays. I located "C" and "E" physically. E is actually a T-connection off of a nearby heater line, and C is over near the back of the engine block. I also looked around elsewhere in the service manual, and found this (red C/E marks from me):

Looks to me like C+E don't even need a bypass connection. One could simply cap them off right there and be done with it, as the throttle body coolant path is independent of everything else. So now it looks like remove the 4 soft hoses, put crappy dust caps on the 4 throttle body connections and the 2 sides of the tiny rear hard line, and then put 2 good cap-offs (as in, must prevent leak of hot coolant) at points C and E.

03-31-2009, 02:04 PM	#1 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	Pg 29 of EM.pdf (from the service manual available on this board) has the exploded diagram for the "Intake Manifold Collector" as they call it, which is the upper air intake plenum and the throttle bodies attached to it. It doesn't appear any coolant is routed into the plenum itself, but you can see the lines that go through the throttle bodies. I've marked them up on this copy of the diagram (C & E are water/heater hose connections to elsewhere): While the intake air cooling effect of modding this is probably minimal, once someone comes up with a neat little solution for it, it will probably be $3, making it still good bang for the buck. Just need a bypass hose hooking C directly to E, completely remove various soft hoses (6, 7, 15, 16) and possibly the rear hard line that connects 16+7 (if it's not welded to the EVAP hose that runs parallel), and put 4 little caps on the throttle bodies' inlets/outlets. __________________ 7AT Track Car! Journal thread / Car setup details Last edited by wstar; 03-31-2009 at 02:08 PM. Reason: Oops, had some wrong numbers above

03-31-2009, 02:10 PM	#2 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	On the plenum side of things, the service manual doesn't say anything about it having an upper and lower half to space apart, I'll have to look on the car itself and see if it's all one piece later. That's also a cheap/easy mod some guys apparently did on 350's for a nice little gain. __________________ 7AT Track Car! Journal thread / Car setup details

03-31-2009, 02:46 PM	#3 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	Ok I looked at the car briefly, that rear little hard line from the earlier diagram is welded to the same mount as the evap line, so I guess it stays. I located "C" and "E" physically. E is actually a T-connection off of a nearby heater line, and C is over near the back of the engine block. I also looked around elsewhere in the service manual, and found this (red C/E marks from me): Looks to me like C+E don't even need a bypass connection. One could simply cap them off right there and be done with it, as the throttle body coolant path is independent of everything else. So now it looks like remove the 4 soft hoses, put crappy dust caps on the 4 throttle body connections and the 2 sides of the tiny rear hard line, and then put 2 good cap-offs (as in, must prevent leak of hot coolant) at points C and E. __________________ 7AT Track Car! Journal thread / Car setup details

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