TB COOLANT BYPASS

[Chilicat]

where are the tb coolant lines i have to bypass?
any info or pics will be appreciated
thanks

[SappySE107]

RE: TB COOLANT BYPASS

dont, its a major hassle to do on the DOHC.

[dohcfiend]

RE: TB COOLANT BYPASS

if he has a 96-97 it is pretty easy otherwise like he said don't bother.

[Chilicat]

TB BYPASS

ok thanks ,won't do , it's a 94 z34

[brian89gp]

RE: TB BYPASS

To do it properly you have to somehow block the passage in the lower intake, drill and tap the lower intake right above the heater core outlet, and run a hose to that point. Not really worth it unless you have your plenum off every week.

[LoominaZ34]

Now why is there coolant running through the throttle body in the ifrst place? My coolant is usually aournd 180* my engine doesn't need 180 degree air.

[RednBlack]

Now why is there coolant running through the throttle body in the ifrst place? My coolant is usually aournd 180* my engine doesn't need 180 degree air.

It isn't there to keep it cool. It is to keep it, (The TB), warm. Doesn't affect the air temp much at all, if any. Air moves through the TB way to fast to be heated. There are no facts to back up removing it. This idea belongs in Ben's "Myth" section. Oh..it is! http://60degreev6.com/modules.php?op...rtid=13&page=1

[sspeedstreet]

Mostly I've been following this thread because it would be nice to be able to pull (or at least move) the upper manifold on a '91 - '95 without opening the cooling system.

[34T]

I read somewhere from what I remember as a trusted source (IIRC...? - can't find it now) that the line thru the throttle body acts as a coolant bypass for when the thermostat closes; so that it is quite necessary. Coolant flow would stop if this is blocked. A bypass (but not a block-off) would be ok then, I guess but it seems like a lot of work and would only be convenient for repeated on/off of the intake. Altho it does seem like a nice feature if there was some way to accomplish it fairly easily. I am going to look at it as I plan on doing a custom intake; hopefully this summer.

[SappySE107]

For the modified intake manifold I plan to do (and have on the store after its tested), I will have a coolant bypass for the TB, since I won't be using the stock location for the TB anyway. Its a bit different though because I will be able to tap that stock location and run the coolant to the stock location. For a stock setup, its just too much hassle, even if you do pull the plenum off often as I do, because that 1 line that sucks to do is real easy with the screw facing the right way.

[sspeedstreet]

Mine's kind of a different deal in that it's going into a Fiero. Bleeding the system on them is a PITA and has to be total or the engine will overheat.

[RednBlack]

Same here Ben. My new TB doesn't have the coolant passage. I do however have to keep the original set-up, as a just in case. I'm working on it. I have looked at it and might be able to tap and plug, without disturbing the o-ring seat. I guess I could get another LIM to play with. Probably ought to do that anyway. BTW sspeedstreet,...you can install bleeders just about anywhere you need them.