Single coolant outlet head.. Pros/Cons

AMA714 · Post by **AMA714** » February 24th, 2011, 8:22 am

I know I read a thread on here before about the single outlet, but cant seem to find it.

Obviously a single outlet makes using unmodified CRF rads possible, but what was the downside. Coolant flow or volume, pressure etc????

If someone has a link, or has experience with this mod, please redirect me.

Thanks
Zach

yota · Post by **yota** » February 24th, 2011, 12:59 pm

been running mine since jan 09, don't know of any down side.

Post by **AlisoBob** » February 24th, 2011, 1:26 pm

I think it really dosent matter.

If you can get the correct sized single elbow to connect the CR500 engine head to the left side upper tank on the 250F conversions, it will look clean and OEM 4 stroke and require less work.

If you get 4 elbows and replumb everything to look CR500 OEM, that works well too. Might increase coolant capacity a tiny bit.

It all works....

http://www.youtube.com/user/500bigbore · February 24th, 2011, 1:48 pm

didt this all get talked about and someone did the flow and the single outflowed the dual anyhow

Post by **AlisoBob** » February 24th, 2011, 2:05 pm

I did the math.... the big single has more area than 2 small ones.

fastkart · Post by **fastkart** » February 24th, 2011, 2:46 pm

My stuff is all single and I've had no issues. I've had both outlet pieces removed, the head tapped for 1/2" pipe thread, run one outlet and a threaded plug in the other.

AMA714 · Post by **AMA714** » February 25th, 2011, 7:42 am

Thanks for the replies guys..

I kinda figured that if the super hot 4 stroke lives with a single, than the big 5 should have no issues.

I would like to see some ideas of how how hoons have done their own. May make me rethink how I want to do it.

Post by **AlisoBob** » February 25th, 2011, 7:55 am

Badda-Boom Badda-Bing

fastkart · Post by **fastkart** » February 25th, 2011, 8:03 am

It's not real pretty, but I didn't have the fittings I wanted in time.

AMA714 · Post by **AMA714** » February 25th, 2011, 8:27 am

fastkart.. have you changed to different fittings? and if so, what did you use.

fastkart · Post by **fastkart** » February 25th, 2011, 8:37 am

As stated in my first post in this topic, both original outlets were removed, then the holed drilled/tapped for 1/2" pipe thread. If you do this, don't used a tapered tap, get a bottom tap if you can, or the holes won't be tapped deep enough to allow the fitting to seal.

I use a 1/2" pipe thread plug threaded into one of the holes to plug it.

On the outlet side, i thread in a fitting that is 1/2" pipe on one side and -12AN on the other (-10AN will work fine, but I like the thought of more flow) similar to

On the top side of that fitting, I use a fitting similar to this

quicfix500 · Post by **quicfix500** » February 25th, 2011, 8:39 am

Fastcart, is that a 1/2" plug for a metal electrical box?

fastkart · Post by **fastkart** » February 25th, 2011, 8:42 am

Here's the plug http://www.speedwaymotors.com/Aluminum- ... s,989.html

fastkart · Post by **fastkart** » February 25th, 2011, 9:15 am

I think you were referring to the plug in the pic... who knows that that is. It's got some jb weld or other epoxy around it and was installed by Glen @ GSS. It works and doesn't leak, whatever it is.

The one I linked in my previous post is the one I used when I did it myself.

http://www.youtube.com/user/500bigbore · February 25th, 2011, 9:36 am

the fittings are called ORB when its strait thread at the base instead of pipe taper.
There is a weld in version available too, keeps the height down if thats a concern.
The hose end pictured is a "socketless" version, cheaper than a lock style and fits common hose, but to make it lower you could used a forged end

hoofarted · Post by **hoofarted** » February 25th, 2011, 9:59 am

fastkart - have any pix of the rest of the cart?

AMA714 · Post by **AMA714** » March 21st, 2011, 12:42 pm

In case anyone was interested in the single outlet that Shanman used to supply... The machinist that made them can still do them. Call Rob at East Valley Precision 480-288-6601

matt_NC · Post by **matt_NC** » March 21st, 2011, 1:43 pm

this is way cheaper.........

I got this idea from Lonewolf's build.

CRF450/250 outlet elbow.

$11 OEM part.

Clearance one hole, weld in the elbow, weld the other hole shut.

pstoffers · Post by **pstoffers** » March 21st, 2011, 2:02 pm

AMA714 wrote:In case anyone was interested in the single outlet that Shanman used to supply... The machinist that made them can still do them. Call Rob at East Valley Precision 480-288-6601

That is not true.. I own the files to all of shanmans parts. I will have all the parts and prices available soon.

ShanMan · Post by **ShanMan** » March 21st, 2011, 2:04 pm

**UPDATE**

Paul Stoffers has stepped up and purchased the designs for the engine covers (clutch & ignition), and every part I have designed for Gen 1 and Gen 3.

Additionally, I have taken possession of all the remaining inventory that my machinist had on hand. He will no longer be making any parts, so please contact Paul Stoffers for all future orders. Rob at EVP will NO LONGER BE SELLING CONVERSION HARDWARE.

Myself or Paul will publish the inventory list in the next few days along with pricing.

Thanks hoons,

Shannon aka ShanMan

krokodilen · Post by **krokodilen** » March 22nd, 2011, 12:57 am

Random pics from my build modified squish band aswell!

Edit: The links doesnt work so you just have to paste them in your browser.

/Christer

AMA714 · Post by **AMA714** » March 22nd, 2011, 6:30 am

Very cool..

Paul let us know when you have parts ready to go. Im interested in the outlet if you have one..

AngryShawn · Post by **AngryShawn** » March 22nd, 2011, 8:42 am

Just get teemtrubble to do one for you

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » March 22nd, 2011, 8:59 am

ttm parts looked nice, but didnt work out all that well. theres nothing for a barb to hold the hose on, and its a queer sized outlet

I made some like that but correct, i'm leaning towards the single outlet stuff now

matt_NC · Post by **matt_NC** » March 22nd, 2011, 9:02 am

In one if his posts TTM said how tough it was to weld around the inside of the head outlets on that design.

Did it never occur to him to bore one outlet to 3/4 and plug the other?

BannedCR500Riders.com

Single coolant outlet head.. Pros/Cons

Single coolant outlet head.. Pros/Cons