Nova cooling heads

Nova cooling heads
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Nova cooling heads - 8/6/2004 8:35:06 AM

rhed

Posts: 71
Joined: 3/14/2004
From: n/a, HI, USA
Status: offline

Any benefits of running one of these heads on the M26. I was told that you could run the engine harder (lean) because it'll knock off atleast 80 degrees off.
Alot of peps use these heads at the tracks. http://www.novarcproducts.com/racepro.html

< Message edited by sc LT-1 -- 8/6/2004 3:36:29 AM >

Post #: 1

RE: Nova cooling heads - 8/6/2004 1:45:54 PM

cjx2

Posts: 14
Joined: 7/18/2004
From: , IN, USA
Status: offline

I ordered one last night so I will post my findings. I can't image it would knock off that much (80) but I am thinking maybe 40 degrees sounds more feesable. Although the factory head is pretty thick so it may do more.
Chris

(in reply to rhed)

Post #: 2

RE: Nova cooling heads - 8/6/2004 2:08:18 PM

fantomas

Posts: 1339
Joined: 6/24/2004
From: Portage, IN, USA
Status: offline

alot of people use the nova head for the MGT's stock engine, but i havent had any over heating issues with the MACH 26..

(in reply to cjx2)

Post #: 3

RE: Nova cooling heads - 8/7/2004 2:04:58 AM

jefx

Posts: 3562
Joined: 8/19/2003
From: mach pk, IL,
Status: offline

quote:

ORIGINAL: sc LT-1

Any benefits of running one of these heads on the M26. I was told that you could run the engine harder (lean) because it'll knock off atleast 80 degrees off.
Alot of peps use these heads at the tracks. http://www.novarcproducts.com/racepro.html

A cooling head will reduce temperatures, but you shouldn't lean the engine more just because of that. 2-strokes need a certain amount of lubricant in order to run without damage, and that lubricant (oil) is mixed in the fuel.

This engine (in my experience) runs cool enough not to need a different head. But this is how a cooling head works:

If the engine runs at 250 (for example) with correct needle settings, and the aftermarket cooling head claims that it'll reduce temps by 40 degrees, then your new target temperature should be 210 degrees. You shouldn't lean it to the point where it hits the said 250 with the aftermarket head, because even though it isn't "overheating" it is running too lean.

A "cooler" head only reduces temperatures, but the same amount of oil still needs to get in the engine for proper lubrication. Since this engine easily runs in the 220-250 range with plenty of power, adding a cooling head will bring the temps dangerously low at 180-210. Leaning it out to bring it back into the proper heat range would mean starving the engine of precious lubrication.

A cooler head is only a benefit for engines that naturaly run too hot, like the TRX 2.5 for example.

_____________________________

Who farted??!!

(in reply to rhed)

Post #: 4

RE: Nova cooling heads - 8/7/2004 2:43:39 AM

cjx2

Posts: 14
Joined: 7/18/2004
From: , IN, USA
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quote:

adding a cooling head will bring the temps dangerously low at 180-210.

Not sure I understand. Why are these temps dangerous?
Can these temps do damage to the motor itself?
Chris

(in reply to jefx)

Post #: 5

RE: Nova cooling heads - 8/7/2004 3:59:59 AM

creyc

Posts: 911
Joined: 6/26/2004
From: Safety Harbor, FL, USA
Status: offline

An engine performs best at a certain heat range. Just as you don't want to overheat, you also don't want the temp to go too low, it's just not a very common thing with these 40MPH nitro burning beasts.

Also, don't forget to watch for that trail of smoke at high speed! It's a good identification of how the engine is running and is something a temp gun won't tell you. If there's little or no smoke and a very high-pitched screaming that means it's way too lean, open the high speed needle a few hours. If there's heavy smoke it's rich.

If I bought a replacement cooling head I'd run it a bit more lean but no more than an hour or two. It's really a balancing act keeping your temps right, the mixture not too lean or rich and still get the best power from your engine. Therefore to reducing sending this "balance" way off from where the engine manufacturer designed it to be I would only buy a head if you have heat problems. If you bring your truck in every time and it's scorching no matter how properly tuned it seems to be, maybe because of the body or engine placement or eve outdoor temperature; then I would look to a new heat sink.

(in reply to cjx2)

Post #: 6

RE: Nova cooling heads - 8/7/2004 6:08:02 AM

ronz

Posts: 192
Joined: 8/11/2003
From: Vancouver, BC, CANADA
Status: offline

the temp wont do the damage, the lack of lubrication will. Thats if you change to the aftermarket head. Thats one of the reasons why I have never gone to an aftermarket head

(in reply to creyc)

Post #: 7

RE: Nova cooling heads - 8/7/2004 6:42:42 AM

cjx2

Posts: 14
Joined: 7/18/2004
From: , IN, USA
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Thanks for the input, I went with the head not to be able ot lean it out more than it is but hopefully just to keep the temps a little lower during the summer heat and keep unneeded stress off the engine. I figured as it cooled down I would either change it back to stock or leave it depending on how low the temps got on the truck. It has been unseasonably cool here in Indiana as of late but I am sure we will still get some scortchers before it is all said and done.
Right now I still have my temps at about 220-230 range. It is pretty rich still becuase I am getting a very thick trail of smoke. I figure while I am just bashing I will keep it rich. I am hoping to race it though and I will start leaning it then.
The only disppointment with the truck is the off the line acceleration but I am guessing it still is just too rich on the low end. I am wondering however if my slipper is too loose, however I am concerned about toasting the gears if I tighten it down too much.
Chris

(in reply to ronz)

Post #: 8

RE: Nova cooling heads - 8/7/2004 11:28:32 AM

rhed

Posts: 71
Joined: 3/14/2004
From: n/a, HI, USA
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thanks! You peps just saved me $40. I'll just used my stock heads. Besides I'm doing wheelies @240 degrees.

(in reply to cjx2)

Post #: 9

RE: Nova cooling heads - 8/7/2004 10:57:19 PM

creyc

Posts: 911
Joined: 6/26/2004
From: Safety Harbor, FL, USA
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Off the line acceleration is actually pretty good for a truck of this size. I've heard of people doing wheelies in high gear but for the most part it is reasonable for a 12+ pound truck. My slipper is about .75-1 turn out if you needed a reference.

(in reply to rhed)

Post #: 10

RE: Nova cooling heads - 8/8/2004 4:07:28 AM

rhed

Posts: 71
Joined: 3/14/2004
From: n/a, HI, USA
Status: offline

thanks for the reference. hey, good thing you mention that because I totally forgot to check the slipper adjustment out of the box. thanks again. BTW I'll try your settings.

< Message edited by sc LT-1 -- 8/7/2004 11:08:01 PM >

(in reply to creyc)

Post #: 11

RE: Nova cooling heads - 8/8/2004 4:50:48 AM

MUDSHED

Posts: 188
Joined: 7/21/2004
From: Somewhere in the NORTH BAY, CA, USA
Status: offline

Since were on the topic of cooling heads, does anybody know if a XTM 24/7 cooling head will fit on the MACH .26? Here is the reason Im asking. This ebay link will show an LST with an American CNC Machining cooling head.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5913756941

If you cant link to it, here is the item# 5913756941

This cooling head runs for only $25. Not a bad price compared to the Nova huh? The CNC site does not show a head specificly for the Mach .26, so Im thinking its gotta be the XTM head right?

http://www.acncm.com/SearchResult.aspx?CategoryID=11

< Message edited by MUDSHED -- 8/8/2004 4:53:24 AM >

(in reply to rhed)

Post #: 12

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