Glow Plugs

[Bob Morton]

Bill McGraw has best prices on quantity purchases of plugs. And I don't work there.......

HUMMMMMM and were do you work ???

 

[boaterbill]

Hey Bill I thought that it was McCoy making all of the plugs..

Watercadet,

I'll find out tomorrow and post it

 

[boaterbill]

I havent bought from McGraw in a long time, get all my plugs from Gary Preusse 630-279-2451 excellent price and delivery time.

 

[boaterbill]

All right guys here's the run down on plugs.

Company in California by the name O&R started by Harry Rice overrrr 30yrs ago they make 80% of the plugs in the USA for companies. There is a small company in the east coast that makes plugs called Fireball. Fox makes their own.

In Italy plugs for Rossi, NovaRossi, CMB are made by one company, don't know name.

Bill

 

[Chris Wood]

Dave,

Do you notice any difference with the cone lock plugs in your 21 motors?? I have thought about trying some but they are pricey..

I have been running k&b 1-L in the twenty motors with good luck.. I tried mc-59 and they are junk..

mc-9 i feel are two cold..

chris

 

[Don Ferrette]

Bill McGraw has best prices on quantity purchases of plugs. And I don't work there.......

HUMMMMMM and were do you work ???

HAHAHAHA I don't!!! :lol: :lol: :lol: :lol: Looks like that will change March 1st. Vacation's over I guess...

Well I can't complain, it's only been 8 months off......

 

[DaveMarles]

Chris, in a .21, cone plugs are worth 500 rpm. No normal type plug can compare.

Dave

 

[Buddy Beaird]

Dave:

Any idea on the cause of the rpm increase. :huh:

 

[apache5056]

Tom.. it has an OS A5 in it so that's what I ordered from Tower. That and some #8's as well.

I talked to Rick M. today and he was telling me that little MAC is in awesome condition. I am working on the bottom at the moment. I have it in primer and should be ready to paint in the morning. It won't be perfect and the only reason I did it was to change the drive to surface.... He also recommended the OS A5 with 60% Red Max..... Zoom, Zoom....!!

I have a bid on a 21 Parabolic that's on Ebay at the moment.

I think this is gonna be a way fun little boat....

Lordie... does this mean I'm slowly slipping to the dark side.... ?? HELP.. SOMEONE TOSS ME A 2X4 SO I DON'T GO DEEPER....

 

[Mike G]

NGK Wayno, come on back to the gassers! B) B) B)

 

[Joe_Knesek]

Dave:Any idea on the cause of the rpm increase. :huh:

It's easy to see that the cone lock chamber has a more consistant radius and the plugs seal better.

 

[TimD]

They are able to dissipate heat from the plug body better than the conventional plugs. They also allow slightly more compression.

 

[HendricX]

In Italy plugs for Rossi, NovaRossi, CMB are made by one company, don't know name. 

It's Cipolla

Glowplugs on botom of the page.

 

[TimD]

Are you sure about that Hendrick? I've been using Cipolla for years as well as Novarossi and the Cipolla conelock plugs do not seem to seat as well as the Novarossi's.

The Cipolla Red's changed a few years back too - they used to be black in colour and had a short stem, now they are Silver and have a large stem - element seems the same.

 

[Joe_Knesek]

I've been using Cipolla for years as well as Novarossi and the Cipolla conelock plugs do not seem to seat as well as the Novarossi's.

Tim, I've experianced the same thing. The Nova Rossi plugs seat a lot better and seem to last longer.

 

[DaveMarles]

Henk, I don't think thats correct. I agree with Tim, Cipolla are nothing like the Novarossi, the body is different, the seal is different, the element is a different alloy. The quality is different too!.

Regarding the reason for the conelock plug performance increase. I agree that the combustion chamber is a better shape. The plug is also cooled better but thats probably a disadvantage with higher nitro.

The reason is that the seal at the base of the plug removes the performance loss of the wasted air space around the plug threads on a conventional plug. That probably explains why the performance advantage is not so marked with a .45 or .90. I was told this a few years ago and tried a simple test on the bench. On a .21 I epoxied a glowplug ( McCoy 9)into the head of a CMB 21 and saw 400 to 500 rpm rpm increase with no other changes. Did it twice to make sure.

Dave

 

[Kevin_R_Clark]

Whoa ,whoa!!! What do you mean wasted air space around the threads. Are you saying that the conventional plug is supposed to hang down int the combustion chamber. Hang on, I just checked 4 different motors. Jeez they are all over the place- 1 hanging in by a thread or so , a couple sort of close to flush, and 1 up in by a thread. That`s what I get for assuming I suppose. SOOO, is flush what we are looking for, can`t imagine you would want anything else. Sounds to me that cone lock plugs basically do away with this problem. Checked the one cone lock head I have and it is perfect. Are the rest of you indexing your standard plug heads as a matter of practice?

 

[TimD]

Are the rest of you indexing your standard plug heads as a matter of practice?

Yep

The threads are a lot finer on a conelock plug also = more contact surfaces to the button.

 

[DaveMarles]

By wasted air space I mean the airspace in the threads between the plug and the head. It might not seem like much, but its there and it has a bigger effect than one might think. A cone plug is not affected by this because it seals at the bottom. A bit like the wasted air space at the side of a cylinder head if the head doesnt fit closely into the liner. Instant power loss.

Dave

 

[boaterbill]

Dave,

You're right about this one. You also, Joe.

Bill