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Author Topic:   R44TX Plugs, Dbl-Hump Heads
Deak-Jr
Dirt Forum Racer

Total posts: 81
posted April 11, 2005 12:31 PM  
Thinking of running R44TX plugs in #461 heads (hobby-stock motor). The book shows the X suffix is intended for H.E.I. (which we're running).

Anyone else heard tried this, or is there a problem with running these anyone knows of where I should stick with R44T's. We've got 8 of the TX's which is why I'm asking before buying another set. Thanks.

Deak-Jr
Dirt Forum Racer

Total posts: 81
posted April 11, 2005 12:49 PM  
I guess I should also ask: tapered or not (R44 or R44T) ....

Thanks much. New at this ....

Raz_900
Dirt Forum Champ
Total posts: 635
posted April 11, 2005 08:30 PM  
Most 461s use gasketed plugs. Some people use tapered plugs by just ramming them in not knowing they really should use the other ones.

Depending on the compression, 44s are a little hot. I'd start a range or 2 lower and work up. Autolite AR72s or NGK R5670-7s would be a good start to. I'm using the R5670s in mine this year. In NGK, a 5 is a hot plug and a 9 is the coldest R5670 they make. side benefit, they're usually $2 or less where the ARs are going for $4 or so now.

A. Bighurry
Dirt Full Roller

Total posts: 35
posted April 11, 2005 08:52 PM  
The R44 plug will work well. Those heads do use a gasket seated plug, not a tapered seat.
The "T" after the heat range stands for "tapered", usually followed by an "S" for seat.Make sure to check the plug gap, they're usually only about .032-.035, and can stand to be opened up for an HEI or other electronic ignition.

sjakes
Dirt Freak

Total posts: 254
posted April 12, 2005 05:57 AM  
Deak I used the R42's last season in my 461's but it was on a higher compression 406, so I wanted a cooler plug? Hope this helps, just don't melt it down. Its gets to expensive, that way. Believe me I learned the hard way. *Ouch*


Deak-Jr
Dirt Forum Racer

Total posts: 81
posted April 12, 2005 06:24 AM  
Hey, thanks much for the replies. Trying R44 to start (no tapered seats). Not a ton of compression, not sure what it'll be but it's a 400 w/stock rods & pistons, 461 (64cc, ballpark) heads. I'm guesstimating around 10-to-1 or a hair higher at most. Still running at least half race gas (lead for valve seats, older heads).

Istock66
unregistered Total posts: 81
posted April 12, 2005 06:31 AM           send a private message to Deak-Jr   Edit/Delete Message   Reply w/QuoteBBBBBB
I have only ever used tapered seats in my hump heads.

I use the tapered adapter on my compression gauge and leakdown guage also.

The head is tapered at the threads on all 13 sets I have.

rico 08
Dirt Forum Champ
Total posts: 1139
posted April 12, 2005 04:16 PM  
The s stands for extended tip..
I run R44's in my humps.

A. Bighurry
Dirt Full Roller

Total posts: 35
posted April 12, 2005 09:19 PM  
Rico, you're right on the "s". I had been given bad information some time back and assumed that it was correct. I wondered after posting earlier if it was right since "x" dictated that it was for an HEI. It didn't seem likely that "s" referred to seat. My mistake on the notation.

rico 08
Dirt Forum Champ
Total posts: 1139
posted April 13, 2005 06:12 AM  
no biggie

i was a parts man for a long time

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