Paul:
I have purchased the RX8 water pump block from Jeff D. (pic attached)
but cannot find the exact radiator cap bung (o-ring sealed) that will
fit it.
Do you know exact supplier or part #?
Thanks and regards,
cozyflyr
I can't find it either. I looked recently. Apparently the company went
out of biz.
Did you check speedwaymotors.com
<http://speedwaymotors.com> ?
They have a small weld on that my ace tig welder could weld but there
would be a charge.
They have a bolt on that might fit if turned down.
If you find a larger one I will turn it down on my lathe no charge.
Randy, we need to redesign this part.
Paul Lamar
Question The photo here with this pump is specially made for improving
cooling efficiency? If so who is making it? I'm Interested.
For the cap bung, it might be a metric one, that maybe the reason you
don't find it. If you can give to me some measurements, then, I can look
for it as in Europe metric is common....
Pascal
I believe the pressure caps are standardized through out the world.
I think Randy in Colorado will be making those in the future. It is an
adapter to the RX8 water pump that is designed to clear the p-port slide
throttle. Here are some more pictures and 3D's. The radiator works best
on the cool side of the engine so this gets the coolant going in the
right direction. The muffler shown in these 3D's is obsolete as we have
come up with a much better solution.
Here is Neal Ungars experience with the install.
Quote.
To those as stupid as myself,
I have the renesis motor with Jeff
Doddridge’s water block to replace the original manifold. It fitted
beautifully but once I filled the coolant I noticed a slight leak at the
bottom.
Cursing myself
for having not fitted it properly I removed it (along with the slide
throttle and pipes, an hours work) to find what seemed not enough
clearance between the block and a washer. I cleaned everything up,
filed more clearance between the block and the surrounds, refitted the
water manifold, and no leak, Eureka!! A few days later I noticed a
slight water leak down the front of the motor, and next day the same
water leak at the bottom of the manifold once again. This was with no
pressure in the system at all, so it could not go “as is”. Once again I
removed everything and again could not see anything wrong, clearances
were not the problem. I now suspected the welds on the manifold block.
Much filing and probing with a needle revealed no possible hole in the
weld.Then it finally dawned, I am totally stupid!!
When I had put the manifold on both times, I had been very
economical with the gasket putty so as to not have too much squeezed out
into the water channels.
Therefore I simply applied the gasket goo to the surrounds of the
manifold holes.
Lovely job I did too. What I forgot however was that Jeff Has put 2
internal mounting bolts to hold the manifold onto the engine block,
again nicely done. In my effort to minimise the gasket goo, I omitted
to surround both bolt holes with gasket maker. That allowed the coolant
to seep down the bolt holes and out. It was impossible to pick up the
source of the leak being so slow.Well I fixed it!
There is probably so much RTV on the join now that I have probably
blocked both manifold holes! Actually all I did was to put a smear
around the head of both internal cap screws so that the coolant is
prevented from passing the head of the screw. Why did I not pick that
in the first place?? Hopefully it will prevent someone else from
getting into a temper.
Neil. Unger
end quote.
Paul Lamar
I had a similar experience. It was finally fixed when I decided to go
with a factory metal thermostat housing gasket... problem solved. My
recommendation to all who use this adapter block is to also use a new
factory gasket.
It will save you much aggravation.
Mark S.
This one fit mine:
http://www.ebay.com/itm/261598244821?item=261598244821&viewitem=&vxp=mtr
It was a tight fit, required heating the block and chilling the bung.
Ken Aron
That's it.
Paul Lamar
The Rotary Engine News Letter. Powered by Linux. ACRE NL web se.
http://www.rotaryeng.net You Tube
http://tinyurl.com/beqqxas Copyright
1998-2015 All world wide rights reserved.