R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 04-03-2009, 09:35 AM   #1
Tech Adept
 
TRIPC's Avatar
 
Join Date: Feb 2009
Location: dallas
Posts: 120
Trader Rating: 8 (100%+)
Default My second blown OS VSPEC in less then a gallon...WTH

I will never buy a VSPEC again. Man I swear they are junk or I just got a bad couple of batches...

I bought a brand new VSPEC. Break in went smooth and ran great for about a gallon. Then one day I was breaking the motor down for normal maintenance and I found that the top of the piston had a hairline crack in it. Now we all know that OS doesnt offer a "Warratny" cause its a "race" engine. So im fine with that. I bought antoher one of of Ebay that the guy had put a brand new Piston Sleeve in it and had not even broke it in yet.

Got that motor did the break in which was not as smooth as the new one I bought but got it done. Finally got it broken in and started to run really good for about 1/4 gallon.

Yesterday I was at the track and the car was running great. Ran about 5-6 tanks and then noticed that the car got really loud. I was wondering if the RE-11 pipe that I had for it was breaking in or something. But this thing was screaming and very loud.

I get home lastnight and take it apart to inspect and guess what. The bottom of the motor was cracked. Yes the block was craked. The piston was all pitted up at the top and the sleeve was scratched a little..This motor had about 1/4 gallon on it.

The brand new VSPEC that had the craked piston I rebuild with a SPeed piston and sleeve and have not broken that one in yet.

I will never buy another OS engine again..
Sorry so long
__________________
Losi 8B OS V-Spec/Ex-Tech/Novarossi
Losi 8T OS V-Spec (in the works)!
Spektrum DX3S
TRIPC is offline   Reply With Quote
Old 04-03-2009, 09:45 AM   #2
Tech Apprentice
 
Join Date: Oct 2008
Location: warwick,RI
Posts: 97
Default

wow man that sucks i have a v spec and it runs great sorry to hear u haveing problems
HAWK498 is offline   Reply With Quote
Old 04-03-2009, 09:45 AM   #3
Tech Elite
 
imaxx21's Avatar
 
Join Date: Nov 2007
Location: FL
Posts: 2,725
Trader Rating: 1 (100%+)
Send a message via AIM to imaxx21
Default

you bought a used engine off of ebay and the block cracked?
__________________
-Crash
Upgrade RC www.upgrade-rc.com
imaxx21 is offline   Reply With Quote
Old 04-03-2009, 09:50 AM   #4
Tech Adept
 
TRIPC's Avatar
 
Join Date: Feb 2009
Location: dallas
Posts: 120
Trader Rating: 8 (100%+)
Default

Quote:
Originally Posted by imaxx21 View Post
you bought a used engine off of ebay and the block cracked?
Yup. I guess thats the chance you take when buying a used engine..
__________________
Losi 8B OS V-Spec/Ex-Tech/Novarossi
Losi 8T OS V-Spec (in the works)!
Spektrum DX3S
TRIPC is offline   Reply With Quote
Old 04-03-2009, 10:13 AM   #5
Tech Elite
 
MrUnlimited's Avatar
 
Join Date: Oct 2005
Location: Netherlands
Posts: 2,463
Default

I heard a lot of problems about the Vspec's. I was planning to buy one but I got a Go engine instead, very fast and cheaper than Vsuck's I am ran almost 2 gallon's for now and it is now screamin' as it should be. Next engine will be again a Go-engine. It is a pity that they do not make .67 boat motors.
__________________
U5 Formulaboat 1/8 hydroplane - MHZ138 AQUAMANIA - Axial Exo Terra - Tamiya Avante - LC Racing EMB1 - Atomic AMZ 4WD Touring car
MrUnlimited is offline   Reply With Quote
Old 04-03-2009, 10:34 AM   #6
Tech Elite
 
hambone's Avatar
 
Join Date: Aug 2008
Location: Bloomsburg, Pa.
Posts: 2,436
Trader Rating: 1 (100%+)
Default

If the sleeve was scored and the top of piston/head button pitted then the piston pin retainer wire came out. That's the fault of the person that did the rebuild. I did the same thing to my 1st eb modded v spec. It also cracked the block. I've never heard of a cracked piston in a v spec though.
__________________
Rob Hamm
The Nitro Shop
Bones Motorsports
Answer-RC/TLR/Futaba
Snow Monkey Racing
hambone is offline   Reply With Quote
Old 04-03-2009, 10:54 AM   #7
Tech Master
 
JoeyTheRocket's Avatar
 
Join Date: Sep 2008
Location: New Albany, Ohio
Posts: 1,893
Trader Rating: 11 (100%+)
Send a message via AIM to JoeyTheRocket Send a message via Yahoo to JoeyTheRocket
Default

Rule number one in hard core racing is NEVER buy a USED engine!

The second motor you bought I'm sure had a bad rod or crank. He just did a piston/sleeve change, didn't check anything out and through it on EBay. If the rod and crank go bad you can sure bet the case will crack very soon. Happened to me, but I had 15 gallons on mine, so I'm not going to complain.

The first motor sounds like it was a little lean. Should take about a gallon just to do a break in (heat cycle way). I would also think 7-9 gallons of life is average.

Don't forget these are race motors, not your back yard motors. They need good maintenance, good tuning, and good temps.
__________________
Joey Kubat ↔ MWNS Staff www.MidwestNitro.com
Mugen Seiki / AKA Racing / Novarossi / PT RC Racing Oils / Advantage Racing Products
JoeyTheRocket is offline   Reply With Quote
Old 04-03-2009, 11:08 AM   #8
Tech Master
 
cary's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: NorCal
Posts: 1,914
Trader Rating: 67 (100%+)
Default

Quote:
Originally Posted by JoeyTheRocket View Post
Rule number one in hard core racing is NEVER buy a USED engine!

Don't forget these are race motors, not your back yard motors. They need good maintenance, good tuning, and good temps.

that is way O.S. does not give a warranty
but that sucks had one go bad on me
__________________
Xray XB8 14,AE RC8T3,XB9 13,Kyosho wheeler,Losi SCTE 2.0,+ More
> The Animal,Frank L. Jr. <
~~~~RedRock Hobbies~~~~
cary is offline   Reply With Quote
Old 04-03-2009, 12:26 PM   #9
Tech Master
 
JoeyTheRocket's Avatar
 
Join Date: Sep 2008
Location: New Albany, Ohio
Posts: 1,893
Trader Rating: 11 (100%+)
Send a message via AIM to JoeyTheRocket Send a message via Yahoo to JoeyTheRocket
Default

Send it in to Hobbico, I'm sure if its that new they will see that when they open it up. They will take good care off you if its a problem on there end.

These engines are also manufactured on a fast assembly line so not every single one is going to be prefect. There will be some that get by the QC department.
__________________
Joey Kubat ↔ MWNS Staff www.MidwestNitro.com
Mugen Seiki / AKA Racing / Novarossi / PT RC Racing Oils / Advantage Racing Products
JoeyTheRocket is offline   Reply With Quote
Old 04-03-2009, 12:28 PM   #10
Tech Regular
 
markr04's Avatar
 
Join Date: Jan 2009
Location: TX
Posts: 421
Trader Rating: 1 (100%+)
Default

Yo Chris,

Sorry to hear the final analysis of your engine. My first V-spec is still new and I'm hoping I don't have any problems with it.

I'm liking my Go-Tech engine, too, for about 30% less $$. I've got the 7-port on my 8ight-T. You're welcome to drive it next time we meet up and see if you like it. I'm not trying to sell it to you, just saying you could test-drive a Go-Tech in a truggy you're already familiar with.
__________________
Xray 808 2010 Spec - O.S. V-Spec Speed - Airtronics M11-DSSS
Losi 8ight-T 2.0 - RB Killer 9 - Airtronics M11-FHSS-2
Losi XXX-CR - Tekin RS / Novak Ballistic 13.5 - Airtronics M11-FHSS-2
markr04 is offline   Reply With Quote
Old 04-03-2009, 12:57 PM   #11
Tech Elite
 
22Racer's Avatar
 
Join Date: Mar 2002
Location: Wanamingo Mn
Posts: 3,079
Trader Rating: 67 (100%+)
Default

At 40,000 rpm everything needs to be within specs. I'm guessing as stated earlier that the crank was worn on the 2nd one and caused it to blow. It is pretty common on the std. V-spec.

Rex
__________________
Rw modding and engine repair http://www.rw-mods.com
Sleeve resizing $15.00/ motor rebuild $30.00
Argus engine distributor/Avid bearings/ Alpha engines/
Fx Royal engines/ Maxy Engines
e-mail rwmods@yahoo.com Rex Welch
22Racer is offline   Reply With Quote
Old 04-03-2009, 12:59 PM   #12
Tech Regular
 
RacerScott's Avatar
 
Join Date: Nov 2005
Location: St. Joseph, MI
Posts: 469
Trader Rating: 7 (100%+)
Default



<-------------------

I bought a used p5xs off ebay last october. I raced it 12 times over the winter and the thing ran great, fast and reliable. I didnt flame out once, I sold it on ebay a few weeks ago and got what I paid for it. Now im onto a NR plus 21-4 for this outdoor season, this one new though.
__________________
VP powermaster fuel | Upgrade RC

Scott U.
RacerScott is offline   Reply With Quote
Old 04-03-2009, 01:19 PM   #13
Tech Addict
 
Join Date: Sep 2005
Location: Southern CA
Posts: 743
Default

Quote:
Originally Posted by TRIPC View Post
I will never buy a VSPEC again. Man I swear they are junk or I just got a bad couple of batches...

I bought a brand new VSPEC. Break in went smooth and ran great for about a gallon. Then one day I was breaking the motor down for normal maintenance and I found that the top of the piston had a hairline crack in it. Now we all know that OS doesnt offer a "Warratny" cause its a "race" engine. So im fine with that. I bought antoher one of of Ebay that the guy had put a brand new Piston Sleeve in it and had not even broke it in yet.

Got that motor did the break in which was not as smooth as the new one I bought but got it done. Finally got it broken in and started to run really good for about 1/4 gallon.

Yesterday I was at the track and the car was running great. Ran about 5-6 tanks and then noticed that the car got really loud. I was wondering if the RE-11 pipe that I had for it was breaking in or something. But this thing was screaming and very loud.

I get home lastnight and take it apart to inspect and guess what. The bottom of the motor was cracked. Yes the block was craked. The piston was all pitted up at the top and the sleeve was scratched a little..This motor had about 1/4 gallon on it.

The brand new VSPEC that had the craked piston I rebuild with a SPeed piston and sleeve and have not broken that one in yet.

I will never buy another OS engine again..
Sorry so long
Are you running Nitrotane? Please don't break your motors in with that fuel.
CarCrazy is offline   Reply With Quote
Old 04-03-2009, 01:21 PM   #14
Tech Master
 
jabroni racing's Avatar
 
Join Date: Mar 2005
Location: largo florida
Posts: 1,538
Trader Rating: 36 (100%+)
Send a message via Yahoo to jabroni racing
Default

There Have been plenty of posts elswhere about cracked blocks, and OS, not doing anything about it.. I happend to have a vspec parts for sale, including a good block, head, button, and carb ( sleeve), motor is about 1.5-2yrs old, when they were'nt cracking.. PM me if you are interested.. $40 shipped and its yours
__________________
www.facebook.com/jay3638
jabroni racing is offline   Reply With Quote
Old 04-03-2009, 01:42 PM   #15
Tech Master
 
Mr. Twister's Avatar
 
Join Date: Feb 2009
Location: Hendersonville Tn
Posts: 1,271
Trader Rating: 4 (100%+)
Default

Quote:
Originally Posted by 22Racer View Post
At 40,000 rpm everything needs to be within specs. I'm guessing as stated earlier that the crank was worn on the 2nd one and caused it to blow. It is pretty common on the std. V-spec.

Rex
common on v spec's that are not properly maintained, the std v spec is still one of the best engine's made, and with all the issues people post about them, other's read it, and go buy a new one, i have 4 or 5 spec's that are way past a rebuild, but the part's have been maintained and they still win races. and yes, your taking a big chance on buying a used engine, anywhere, ebay or not, if you need a case let me know, we have plenty.
__________________
Brian Carey
615-838-5373
Tennessee Oval Performance
Check us out on Facebook
Mr. Twister is offline   Reply With Quote
Reply



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 07:01 AM.


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