patrick21x

iTrader: (58)

I have been running Odonnel 20% Nitro for a while. I now got three new OS V Spec 21's. I am thinking of going to 30% Nitro. will i need head shims or should the motors be fine?

FrankBlack

Its advisable, the manual says to use the extra shim for 30%.

AreCee

iTrader: (1)

Yes, that is why OS packages the shim with the engine. You will need it for 30%.

shimmyz

iTrader: (4)

I just bought a CEO Powermods Vspec from Chris O'Donnell. He told me as long as it stays around 250 degrees or lower don't worry about the shim. before the CEO I had a stock Vspec with no shim. On a hot day(high 80's), running 30% Losi Nitrotane, my Vspec would come off the track anywhere from 210-220.

racersnow

iTrader: (37)

All my motors needed the shims, would fry the plugs not long after starting if I didnt

Dave.H

iTrader: (2)

No shims and 30% runs sweet.

schmelme

iTrader: (13)

If its around 75+ degrees outside switch to a P6 plug and you'll be fine. I've had good luck with .1mm added and running a cooler plug.

SkarTisu

iTrader: (8)

Use the extra shim for break-in to make life a little easier for the conn rod, then take the shim out after you're done. No shim needed for 30% after break-in.

RunarounD

Without using the extra shim on 30% nitro the engine will run fine, very aggresive powerband from bottom to mid. Using the extra shim will give you a better top end, smoothen the bottom and mid and give you better fuel mileage. The V-spec is one my favourite engine. Currently still have 4 of these excellent engine. Will try out the OS speed version soon.

xlgraphicspro

iTrader: (5)

I run 30% byrons, and haven't added a shim. it runs fine at 210-220. I'm also still using the original glow plug after 2 gallons. the motor comes stock with one shim already installed, That's enough!

Matt Howard

iTrader: (6)

man, you are just the oddball around here. First you're not using the smallest carb insert and now you're not running the extra shim. I betcha your car would be easier to drive and have better fuel economy if you ran the extra shim and the smallest insert See ya sunday

patrick21x

iTrader: (58)

Well I switched it up this weekend. After talking to multiple people I decided not to add the shim. I was using ODonnell 20% and I ended up getting Werks 30%. Holy Shizznit. I could tell a big Diffrence. On the 20% my motor was running 230-240. After filling the tank w/ 30% and no needle adjusment my motor was running rich and slower and came in at 180-190. I leaned it out a bit and it started to wake up. After a few tanks i was able to lean it probably 3-5 hours and it is running freaking awsome. Hauls Balls with awsome power band. Coolest thing is that it comes in around 200-210. My V-Spec is great now. I have two other V-Specs one is a JP modified and I cant wait to see what they baby runs like on 30%.

Thanks to every ones comments on the topic of Head shim needed.

After Doing the switch myself I have learned that you do not need a shim when switching to 30% Nito and your motor will run awsome.

I also learned that the Werks fuel lives up to what people are saying. It does run cooler w/ more power.

I also exsprianced that going from a JP3 pipe to an OS 2060. The temp dropped 15-25 Deg in the motor, Dont know why but it does.

Later guys, Patrick

nhodd

i do run the shim but only because initially was told to.i am fairly new to gas.
I don't run that amount of nitro though.Cant be good for the life of your engine