pre98zetec

do NOT use foil, use a paper towel or a sock. I don't care if its a thin layer of foil, it will hit 250+ FAST

VDub99AML

My Feedback: (1)

I just thought, I need to get a failsafe before I do anything else. I have them on my MT, and other touring car, but I haven't bought one for this car yet. I now have too much $$$ invested in this car to continue running the risk of a runaway.

hpi apollo

you can use foil, just only let it cover half of the head, that way the temp raises a little bit, but make sure you have it tuned like you are about to drive it, running rich is one of the worst things you can do when breaking in an engine

IARacer

Don't you mean running lean? Or did you mean you don't want to be too rich, which is also bad.

hpi apollo

running rich is bad because you need an engine to be ran how it will normally run, too much oil (rich) doesnt let the parts wear in before or get up to the proper temperature, running lean will just eat up the engine and it will last maybe 2 gallons, also running too rich at break in can snap a con rod

Wild YFZ 450

im guessing that only the rotaary carbed os 18tz has the pull starts and the slide carbs have to be bump boxed?

hpi apollo

the carb doesnt effect how its started, bum boxes just sue the flywheel to start

Wild YFZ 450

ya i kno that the carb doesn't and i kno wat a bump box does but i need a os 18 tz with a slide carb and pull start and there is no slide carb with a pull start only rotary carbs with a pull start and i want one for my jato or 4-tec with a pull start i rly dont' feel like carrying around a starter box, thanks

hpi apollo

they dont make an 18tz with a slide carb but the slide carb can be easily swapped

Wild YFZ 450

ya they do but it don't have a pull start [] and retory carb meens that it like turns not slides right?

nitrohead5300

No fair dude you are comparing a stock Viper engine to a modded Supra if you do some work to that Viper motor you could get more hp out of it too possibly match the modded Supra. Hp = how deep your pockets are. But I agree with you you have to judge each motor on its own merit indivisually .

hpi apollo

nitrohead5300, that was the whole point, i was trying to say that smaller displacement engines HAVE THE POTENTIAL to be more powerful than larger engines, like the team orion crf wasp rev .12 makes more power than an 18ss and an 18tz if i remember the chart correctly

flyingjato, yes the rotarty carb just turns, the slide pulls out

Wild YFZ 450

k thanks ill get a rotary pull for my 4-tec

VDub99AML

My Feedback: (1)

Well, I broke in the new .18TZ-TM today, and took the Super nitro out with the stock clutchbell, and spur gears. Needless to say, they lasted about 3 minutes. Both 1st and 2nd spur gears are stripped. So, my question is, what would be a good gear ratio to have on this car. should I keep the spur gears stock at 46 and 43 tooth gears, and just get larger clutchbell gears? If so, what size?

hpi apollo

you want to get the highest ratio possible with that engine, but the key is picking the gears to mech right, if you add up the number of teeth on the 1st pinion gear and the 1st spur gear, it should equal the same amount of teeth as there are on the 2nd pinion and 2nd spur gear combined, this allows proper meshing, also, make sure you know how to set your mesh correcly, if you dont, that engine will be mercyless (sp?)

VDub99AML

My Feedback: (1)

So far, I've only been able to find 2 clutchbells that would work. one with 13/16 teeth, and one with 14/17 teeth. I have only been looking at HPI clutchbells, as I don't know what other brands will fit. Any help with finding others that will fit would be great.

Thanks, Aaron

VDub99AML

My Feedback: (1)

Okay, I found something else that may work. Please tell me if it will or not. What if I use the clutchbell and pinion gears for the RS4 18SS? That would be a 19/23 tooth pinion p/n: 76979, 76983, and 86039. That along with the spur gears 47/43 tooth p/n: 76817, and 76843. It will be going on my Super Nitro RS4 onroad car with an O.S. 18TZ engine to refresh memories.