throttle body coolant block off
 

While I.have my motor out I want to clean up the engine bay as best I can. I've seen the bypass kit and read the threads, but can't find anything on blocking off the ports. Is it necessary to bleed coolant past the thermostat with this line? Is the heater core in parallel with the tb coolant lines?

Hey p8ntman
Here's the DIY
https://www.rx8club.com/series-i-do-...ass-mod-36389/

And here's the discussion on the value of doing the mod
https://www.rx8club.com/series-i-tec...ussion-245771/

FWIW IMO I'm glad I did the mod however it didn't do anything performance wise, it's just easier to take the UIM and TB off.
(which I seem to do quite often)

I reported your duplicate post, I've seen the web browser or server do that sometimes. <dunno why, shrug>

Anyways just in case you don't know ... double posting is against forum rulz

Cheers

I don't want to bypass the TB. I want to block off flow at the two connections to the block. I didn't see discussion of that in the links above.

For the throttle body coolant circuit there is a nipple on the rear iron and one of the Tstat housing. How you will block them is up to you.

Oooops my bad.
:p:

OP I'm interested in doing the same thing. My solution was to pull the lines and cap the ports with some rubber coolant caps you can buy at any parts store. One of the ports is fairly easy to get to and is down near the OMP. The other, like 9k said is on the rear iron and seems like it would be a pain to get to. I haven't checked into going through the wheel well, though. I want to get rid of the lines completely, if they're not to impractical to cap off.

Rubber coolant caps? Vacuum caps will deteriorate over time and a leak will ruin your day.

Physically blocking the coolant points is not a difficult task. I'm asking more about if that coolant bypasses the thermostat and always allows flow? Also does the heater core do the same? I want to know if prohibiting flow through those lines will have unintended consequences.

Yes it is always flowing and no blocking it will not cause any ill effects, many turbo guys (me) use that circuit to to feed the coolant lines on the turbo. I have since put my turbo on it's own coolant circuit with a pump and heat exchanger so I just have a line running from the rear nipple to the front nipple since blocking them using caps did not work since all the caps I could find eventually fell apart and leaked.

The next time I have the engine out I will remove the nipple on the rear iron, drill it, tap it, and install a proper plug and then just remove the nipple on the Tstat housing and have it welded shut.

But why do you want to do this?

I want it gone because it makes pulling replacing the motor that much easier. I would like to simplify as much as possible. Also I remove it on all my other quad4 powered cars.

Makes replacing the engine much easier? Umm, no.

If you pull the tube out of the block...it is an easy thread to 1/8NPT...and you can put in a plug :)

I figured this out recently by accident with an old iron I had laying around. Another thing to do the next time the engine is out.

On an assembled engine how do you intend to thread it without metal chips falling in the system? Better off trying to find a small freeze plug to fit it if possible.

Never done it on an assembled engine....but if you are careful and use grease it isn't really too much of an issue .....if it was an oil gallery plug that would be different :)

I don't think he is suggesting pulling the engine and tearing it down to block that hole, if he has to ask in the first place he might not know any better ...

Team, The motor is already out of the car for a rebuild and I want to block the coolant lines before I re-install it, unless someone says "hey, don't do that because xxxxxxx" and their reason is a good one to maintain flow past the thermostat at all times. I know on other cars the heater core is a parallel path around the throttle body, I'm just new to rotary engines.

my bad, missed that, then Dan's suggestion is best

Race engines usually get rid of both of those

Why ?

What size are the holes? Couldn't you just put bolts with a washer and some kind of sealant to keep from leaking? I want to get rid of the line as well but mainly because this is supposed to be a summer car and I want to clean up the bay as much as safely possible

Easiest thing is to use a hose connector and shorten the 2 hoses and then connect them together

The throttle body end of the hoses can just be left open....nothing in = nothing out :)

Actually the easiest thing IMO is to remove the hose from the water pump neck to the TB, take the hose that goes from the TB to to the back of the engine and reroute the TB end to the water pump neck remove/cut off the excess, and connect it to the same nipple the other hose was connected to. Fully bypasses the TB and no extra parts needed ....

I have no interest in bypassing the TB and leaving the hoses, I want only to block them. I did read today that to bleed the coolant system you must remove one of the TB hoses. I will have to find another way.

Its seems like nobody on this forum reads posts completely. A lot of people already know what I should want.

It's not at all difficult. Figure it out yourself.

speaking of which, you're not the only person participating in this thread

try reading Post #20 that started the second wave of responses