Warbird Information Exchange

The Champion number is RHB37E, they are 13/16 reach, 3/4-20, 18mm
with about a .965 dia gasket base.

These are used if various Pratt & Whitney engines.
The key here is pricing, I need quite a few of them. Can be NEW, USED, SURPLUS. Just in okay shape no rusty unuseable junk.

Thanks

those plugs are also used in alot of Lycoming and Continental engines, check with your local FBOs.

$43.60 at one outfit near by.
$33.50 at another place.
I have seen $22.00 online
Thats for new, and if you need alot of them it adds up to a
huge expense. I need something much less expensive.

http://www.pedalcarsandretro.com/Sky_Ki ... html#image


Gary

I hate to say this but here goes:

If you can't afford spark plugs, then you need to seriously decide if you can afford to operate this engine?

This is basic preventive maintenance, and a spark plug failing or intermittantly firing could ruin a pilots day. A miss or engine stuttering at altitude or during a go around could cause an unscheduled landing or worse, trucking the pieces home.

What next? Are you going to strain the old oil thru a piece of cheese cloth to filter it?

_________________
If God had wanted man to fly behind a flat motor, Pratt Whitney would've built one.

Ease up there, not all is as appears.
If you have followed this fellow's posts I believe he is setting up a 4360 for ground run...not flight. 56 plugs can be quite an expense for a simple ground runner. I don't know engguy, just assimilating data that was freely available here. Is that about right engguy? If so, there is not much wrong with running strained oil in that used, beat up, forlorn, abandoned hulk engine that nobody else here has any nerve or ambition to salvage.

Here is the breakdown of your spark plug number
R = resistor type plug
H = Barrel style, in your case 3/4-20
B = mounting thread, in your case 18mm, 13/16 reach, 7/8 hex
37= heat range
B= electrode design, in your case, twin electrode,
y= electrode design, in your case, projected core nose

http://www.championaviation.com/pdf/645 ... _ElecL.pdf

engguy: try the brainiest guy in plugs.... plugguy (click on "Plugs and Parts")
This page shows good used recon ones for $10ea...he may have gaggles of them in lesser condition and cost. A lot of good data on his site.

In the event recondititioned or used RHB37's can't be found at reasonable cost, for a ground run I'd suggest looking into stocks of NOS or gub'ment reconditioned single electrode military plugs... the LS-86 or -87s and many others are still available in large quantities.

I've seen cans of them at the aero auctions and on eBay ranging in price from .50 cents each to a couple of bucks each. A plug reference guide would certainly provide specifics as to which plugs share similarities to the correct application...

Just a thought. As mentioned, there's certainly a way to save money to run up an engine that's not hangin' on a wing...

You are correct. I am finding out A&P's are not what ya all think. Someone mixed and matched small gasket flange plugs with large. Large is what is supposed to be. The small ones just ruin the gaskets.
Thanks for the links I'll give it a go.

the gaskets are not ruined. To recondition them, suspend them from a wire or metal rod, and heat the gaskets until they are cherry red, then drop them into a bucket of water, they will now be soft and bendable.

This is not critical for a ground runner but there is a reason those AC LS-87's are available cheap....they're about the only plug out there with an AD. LS-87 AD something the flyers should be aware of. It is an old note back to '54. I believe that is a typo in the header of the AD, incorrectly referring to the plug as an LA-87.

I have a couple of sealed cans of LS-87's if you can use them.

_________________
REMEMBER THE SERGEANT PILOTS!

Does anyone have the specs on the LS-87's? I looked and cann't find anything.

Matt I knew that anealling deal with the gaskets. These are dimpled and twisted. There is like only a 1/16 or less gasket surface on some of the plugs and maybe 3/16 on the others (radius) guessing the dimensions.

Might Have Them i will check Give me a couple of Days.