R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 01-30-2009, 08:22 PM   #1
Tech Master
 
VenturaDC's Avatar
 
Join Date: Oct 2007
Location: Ventura, SoCal
Posts: 1,131
Trader Rating: 32 (100%+)
Default Pinch Q?

I was wondering when you know its time for a new p/s/r or repinch, im not sure how much fuel has been thru my gotech 3port as i got it used. i am new to nitro but certainly not to rc. im not sure how much pinch is correct as i can rotate the crank via the flywheel by hand and doesnt seem to have much resistance when i hit compression,( well we will call it medium i think, as it for sure doesnt freespin thru the compression part but its not like its really hard to turn either)

the motor runs ok and seems to have a ton of power. It is a little hard to get to idle but i havent doen the needle mod yet so i can say much about that yet.

should i be able to turn the motor by hand easily?
__________________
Dustin Colt45 Aguirre
Kyosho RB6--Futaba--HW--Shuurspeed 17.5
Kyosho SCR--Hitec--Lrp--Yeah 13.5
Durango Dex210--Futaba--Trakpower--Tacon 8.5
VenturaDC is offline   Reply With Quote
Old 01-30-2009, 08:28 PM   #2
Tech Elite
 
pinky2252s's Avatar
 
Join Date: Nov 2007
Location: Broomfield, Colorado
Posts: 3,278
Trader Rating: 4 (100%+)
Send a message via AIM to pinky2252s Send a message via MSN to pinky2252s
Default

Quote:
Originally Posted by VenturaDC View Post
I was wondering when you know its time for a new p/s/r or repinch, im not sure how much fuel has been thru my gotech 3port as i got it used. i am new to nitro but certainly not to rc. im not sure how much pinch is correct as i can rotate the crank via the flywheel by hand and doesnt seem to have much resistance when i hit compression,( well we will call it medium i think, as it for sure doesnt freespin thru the compression part but its not like its really hard to turn either)

the motor runs ok and seems to have a ton of power. It is a little hard to get to idle but i havent doen the needle mod yet so i can say much about that yet.

should i be able to turn the motor by hand easily?

It shouldnt be smooth you should definitly fell the top, but if it runs fine dont worry
__________________
Procrastinators Unite!.....Tomorrow
Team Terribles
pinky2252s is offline   Reply With Quote
Old 01-30-2009, 08:31 PM   #3
Tech Elite
 
Join Date: Oct 2004
Location: Michigan
Posts: 3,295
Trader Rating: 27 (100%+)
Default

Best way to know when it's time is if it starts stalling for no reason say when you're going thru a turn. Or if it won't run unless you lean it way out, and if you can't get it to idle no matter what then it's time.

With the glow plug in you should feel it pop when you roll it over. Not necessarily the mechanical pinch of a new engine, but should get a little hard then turn itself over.

Some like to hold the engine sideways by the flywheel. If it can't hold itself up for a couple seconds with the compression it needs a pinch or sleeve. I've never played with this one. I just figure when they're hard to tune and problematic idle then it's time to freshen up the mill.
__________________
Team Associated & CRC
Trackstar & Hobbywing esc's
Spektrum radios, GensAce batts, turnigy servos.
Keeping racing fun and affordable with my 8y.o. twins :)
The best track I've raced is the one in my backyard!
jbrow1 is offline   Reply With Quote
Old 01-30-2009, 08:40 PM   #4
Tech Master
 
VenturaDC's Avatar
 
Join Date: Oct 2007
Location: Ventura, SoCal
Posts: 1,131
Trader Rating: 32 (100%+)
Default

Thanks for the info, yes it does seem to have some "pop" at the top of the stroke and ill know more about the idle after i grind the needle down.

another question tho, and maybe this is normal or not i dont know, but whats going on when i fire it up and rev it to clear it out some times it idles high, some times normal and then sometimes stutters and dies, the slide ends in the same position everytime, some times if its idling high it will very rapidly go into a really low idle for a bit then die. Probably just my settings but was wondering if there any pointers on that part
__________________
Dustin Colt45 Aguirre
Kyosho RB6--Futaba--HW--Shuurspeed 17.5
Kyosho SCR--Hitec--Lrp--Yeah 13.5
Durango Dex210--Futaba--Trakpower--Tacon 8.5
VenturaDC is offline   Reply With Quote
Old 01-30-2009, 08:54 PM   #5
Tech Elite
 
pinky2252s's Avatar
 
Join Date: Nov 2007
Location: Broomfield, Colorado
Posts: 3,278
Trader Rating: 4 (100%+)
Send a message via AIM to pinky2252s Send a message via MSN to pinky2252s
Default

Quote:
Originally Posted by VenturaDC View Post
Thanks for the info, yes it does seem to have some "pop" at the top of the stroke and ill know more about the idle after i grind the needle down.

another question tho, and maybe this is normal or not i dont know, but whats going on when i fire it up and rev it to clear it out some times it idles high, some times normal and then sometimes stutters and dies, the slide ends in the same position everytime, some times if its idling high it will very rapidly go into a really low idle for a bit then die. Probably just my settings but was wondering if there any pointers on that part

The low end is a 1/8 of turn lean, turn it an 1/8 of a turn out, it should idle high for a few seconds then die down to a low idle
__________________
Procrastinators Unite!.....Tomorrow
Team Terribles
pinky2252s is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
EAMotorsports discussion thread BigDogRacing Team and Company Discussions 7669 08-08-2017 05:39 PM
Manhattan Kansas area Racers and Bashers! buttere Kansas/Missouri Racing 6670 08-08-2017 01:02 PM
SAVAGE - SS, .25, .21 Official Thread! Horatio Monster Trucks 11167 05-15-2017 08:40 PM
Power House RC Engine Performance and ColdFusionFuel Q&A TVMRocket69 Offroad Nitro Engine Forum 1880 10-22-2014 04:22 AM
KO PROPO EX-10 Helios q's Kenshin Electric On-Road 2225 03-13-2014 01:04 AM
Serpent 710 Ron C. Nitro On-Road 23347 03-16-2010 01:47 PM
Sealing a motor piranha21 Nitro Off-Road 61 06-20-2009 06:58 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 01:25 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net