View Full Version : Do I dare try and port the engine?
02-16-2001, 08:08 PM
I want to buy a new engine so I figured what the heck but do you think i can do more good then harm.
Nitro all the way
02-16-2001, 08:53 PM
i tried it and will never go back, this was the first motor i ever ported. as long as you go slow it is really easy. i was looking at buying an OS hyper 15 for my maxx but i dont see a reason since i ported my trx, matter-o-fact i just got a gpm head for it.
02-17-2001, 07:42 AM
does the porting work bring it up to anywhere near the speed of an os .15 hyper or a rossi cx.12
What did u do to yours : just the block ports or did u do the sleve and crank and shave the connecting rod???
02-17-2001, 11:47 AM
i knew i should have taken pics of it at the time. i did the block con rod, sleeve and backing plate, basicly exactly the same as eric shows on http://www.nitrorc.com/mods/engines/trx15mod.html
i didnt play with the crank since i wasn't positive of how and what to do, like i've said i'm no expert with a dremel, there where things i should have done that i forgot but i can always do them later when i rebuild the motor.
since i run a maxx you dont see alot of nova's being used since it is more for small light touring cars but its close to a hyper basicly, of course gearing changes help too. when i dropped to a 18T clutch bell the truck accelerates better and still has lots of top speed.
02-17-2001, 06:16 PM
i was concerned about the samething but the motor does not turn any higher revs then before, but the fact that the con rod is soft aluminum still had me worried, of course i did mine anyway. since porting the motor in my maxx i have over reved it when it wouldn't go into either forward or revs so basicly it had no load, which is highly damaging to a motor(potentially). but the con rod did not snap which has eased some of my worries. i am still considering installing a metal con rod from a different motor.
after porting the motor simply makes more power at all rpms but it does not produce higher rpms, you gain more speed by regearing since you have more power to utilize the taller gear. in the case of my maxx though its oposite i want more acceleration and hill climbing so i have down sized the clutch bell to give it more punch.
02-17-2001, 09:55 PM
believe it or not the trx pro .15 just as powerfull as the os 15 .cvx hyper or original if not powerfuller. rpms are around the same as well. i had a trx pro .15 in my nitro ruslter and was clocked 38.3 and i put a .15 cvx in as well and got it clocked at 38.9. not much of a difference. it was a little tough to pull wheelies with the cvx though. anyways if you are confident that you will not screw up your enigne or have the money to replace it if you do than go for it. you will be pleased with it.
Porting an engine creates less resintence inside of the block. With les res. the fuel/air flow more freely. This in turn allows the engine to rev faster, higher and do it with less work.
You can look at it like rocks in a stream. The water running over and around the rocks create ripples. This slows the waters flow. Remove the rocks and the water can then flow smoothly and by not haveing go around and over the rocks it flows faster. Porting in a way removes the "rocks".
excuse me while I pass some gas
02-18-2001, 12:59 AM
is it wise to remove metal from the connecting rod with the extra revs that will be now porduced?? cause that's what'd probably be the first thing to go at high revs.
02-18-2001, 08:10 PM
A TRX15-Turbo actually does rev higher than the stock engine. The profiled connecting rod has alot to do with it. Less fluid friction leads to higher RPM range. There are other ways of increasing RPM's further but in doing so you sacrifice fuel economy.
A proper selected tune pipe and header length can also increase the RPM range of the engine. Increased engine power is not equivalent to better performance at the track. The secret of using the engine effectively is in the fine details.
1. Fuel Selection
2. Glow Plug & Carb Tuning
3. Clutch Tunning & Gearing
If you guys really liked my how-to-articles
There are more in here
Check out the engine section!
Glad to see you around.
I use the same basics as you when Porting the TRX engine.
I hope that you do not mind. But I have pointed allot of people to your TRX Turbo page.
One question. Have you ever tried an HPI Star .15 steele round rod in a TRX? You must inlarge the wrist/piston pin end a little and press a brass bushing for the pin. But they rock. A few friends and I tried to blow one after a massage with an HPI rod and it took everything that we threw at it.
Any one interested in Porting a TRX .15 Pro. It is well worth the time checking out Erics site.
excuse me while I pass some gas
[This message has been edited by Les (edited 02-20-2001).]
02-20-2001, 08:17 PM
Well i ported the engine in my 4-tec and it is so much more powerfull i am going to have to port my nitro rustlers engine as well. I think the hardest part was finding all the right Dremel bits to use.
Nitro all the way
02-20-2001, 08:20 PM
i totally agree the hardest part has to be finding the bits, i had all of them except the deburring bit which i couldnt find instock anywhere.
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