R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro On-Road > Onroad Nitro Engine Zone

Thread Tools Search this Thread
Old 02-11-2009, 09:37 AM   #1
Tech Addict
hrnts69's Avatar
Join Date: Nov 2007
Location: Nashville, IL
Posts: 552
Trader Rating: 5 (100%+)
Default .12/.15 Engine Building

Hey yall, i figured ill post this here since you guys have some of the baddest small blocks in this hobby!

I race R/C Dirt Oval. I race on loose tracks, so pure HP aint all that important. If i raced on a Clay track, then i would be going with Nova 353. Iam gonna be running a Thunder Tiger .15 and a XTM .18. These are both pull starts. Iam wanting to build them up for this years racing.

I printed out the article that RCA did a long time ago. Which said to smooth out the ports, sleeve. Which iam gonna be doin that. But what else can i do to them to produce more HP? I dont wanna mess with port timing, if i wanted to do that i would send it to a modder.

Do you guys have any more ideas/tips?

Hobby Sport Media
hrnts69 is offline   Reply With Quote
Old 02-11-2009, 12:17 PM   #2
Tech Champion
Roelof's Avatar
Join Date: Aug 2007
Location: Holland
Posts: 6,277
Send a message via ICQ to Roelof

Originally Posted by hrnts69 View Post
Iam gonna be running a Thunder Tiger .15 and a XTM .18. These are both pull starts. Iam wanting to build them up for this years racing.
If .18 is alowed the OSMAX 18TZ is the way to go,.

Your mentioned engines are running on a plug R3/R4?
You can raise the compression by taking out a headshim with using a colder plug (5 or 6)

Drill up the carburator by 0.5 to 1 mm can give more power.

A longer exhaust system can give more bottom power.

Higer Nitro content.
The quality of an answer comes with the quality of the question.
Roelof is offline   Reply With Quote
Old 02-11-2009, 05:52 PM   #3
Tech Adept
chunk t's Avatar
Join Date: Nov 2008
Location: Elgin, IL
Posts: 225


I'd like to add that if you can provide measurements of the engines, then maybe we could give a few other "simple" options. Shimming the sleeve may be an option depending on the current port timing. Knowing the actual head clearance and total shim stack, removing/swaping head shims may give a boost. But without knowing where the numbers are when you begin, any change is simply a shot in the dark.

If you can give me some numbers off of the engines I can tell you where you are and maybe prognosticate the results of some of the "simple" changes offered.

1. head bubble volume 2. head insertion depth 3. shim thickness 4. rod length (c to c) 5. sleeve bore 6. port measurments, exhst/boost/trans (top of sleeve to top of port) 7. TDC (top of sleeve to piston face) 8. BDC (top of sleeve to pistion face). If you need I can talk you through taking the measurements.
chuck "chunk" thomas
1:10, 2-wd Stadium Trucks
B-Mod Tunnels
If ignorance is bliss... I must be in heaven!
chunk t is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
The Big Locked Thread donitaROSE Manila Racers 89718 03-26-2015 08:17 AM
Kyosho VoneR Thread neons Nitro On-Road 12206 06-29-2012 04:19 PM
2009 SEQ Onroad Interclub LOSI123 Australian Racing 348 01-06-2010 11:08 AM
KYOSHO ST-RR 15 tanks old!!!!! littlemotor R/C Items: For Sale/Trade 22 05-17-2008 06:03 PM
RC Sellout! Everything in here must GO! All kinds of stuff. Mustangz R/C Items: For Sale/Trade 35 01-01-2008 09:24 AM
2006 IFMAR 1/10TH 200mm I.C. ON-ROAD WORLD CHAMPIONSHIP phlim Singapore R/C Racers 106 09-05-2006 06:31 AM

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 08:24 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net