Good info right here. This first motor I've got is gonna get filled. Along with a few mods here and there on the crank and sleeve. Can't wait to get er done and racing. What has your fuel milage been like so far?

Crank
 

Well I spoke with Rody about the Crank and he says they tested both and found no difference,He does not like the fact that the puddy could break loose if it is not hardened correctly.

It's actually the drilling of the crank that makes a difference. Silicone/putty filled cranks are bored farther than the intake port of the crank to lighten them. This void that is created by drilling is then filled with a silicone or putty to take up the empty space and bring crankcase volume back to what it was before drilling. The actual silicone or putty really isn't doing anything to gain performance. The crisper throttle response comes from the lighter weight of the crankshaft due to the drilling. In the case of the TQ engine, the crank has been drilled, but not filled. The only difference here between the TQ crank and the filled crank of the GRP will be a slightly larger case volume with the TQ crank. This difference in case volume most likely won't be noticed on the track. The good thing is that the TQ crank has still been drilled and lightened so the throttle response will be crisper. Just some overview about crank filling for the guys that don't know what it is/does.;)

Have go agree with Jammin'.

Filling it does change the low/mid throttle response.

Having the void vs. filling it with silicone can play with reversion properties and fuel mileage as well.

It's much more of a preference thing than a performance one.

I prefer the pull of the filled cranks. It's a minute difference on most engines.

I've never had any of my silicone or factory silicone plugs fail, but I'm careful about what after run oils (if any) I use. Stay away from petroleum distillates.

Both sides have a fair arguement. While a filled vs. non-filled can appear to have similar numbers on a dyno as far as torque and hp outputs, it doen't seem to show you what kind of spool up and fuel consumption the engine will have. There isn't a huge difference on some engines but I know different engine's react to the filling in different ways but the few engine's I have really started to concentrate on like the Plus 4's, Toro Nero's and P5's have all responded very well to the crank filling.

The bore in the TQ is similar to that of the GRP and with an 8-8.5mm straight bore versus a 8.5-10.5mm tapered bore found in the Nova's, the TQ crank will not only have higher bore charge velocity at entry due to the smaller opening but it will sustain it due to the straightness of the bore giving the engine a better low end response. The TQ engine does respond to the filling but it may or may not be as aggressive as the Nova's react to it. Also depending on how much is filled and at what angle can also affect the outcome. Just drilling it and backfilling what was removed won't have the same effect as adding additional filler and changing the angle or sloping the filling deep into the bore as I have done in the past and still do with great results.

The easiest way to see if the engine will respond to the filling or additional filling is restrict airflow at the venturi. If the engine picks up noticable throttle response on the low end, smooths out the midrange and doesn't seem to care either way on top, the engine could probably use tighter volume internally and could benefit from the fill. Now knowing how much to fill and at what angle of entry will be up to the beholder and may require some trial and error.

:nod:

Not knocking anyone for using a dyno at all. They're very informative, useful and generally handy to have around and use.

But, just like in 1:1 and RC...you don't drive a Dyno. ;)

I prefer the dirt track dyno myself. :D

It's all good stuff guys. Thanks for the input.

Pa
 

PARTS ARE NOW IN STOCK!

Just to confirm, all are compatible with the previous GRP branded engines. We now have factory glow plugs too. :tire:

Are parts in stock yet?

I need some glow plugs.
























;):p

I didn't mean to yell. I just wanted to make it easy to find. :blush:

tq.
 

Who has the parts in stock? P/S Thanks

The parts like the engines are in-stock at the HobbyWorks distribution center. Your local hobby dealer can order from HobbyWorks at great prices. The phone number is 301-725-6033, or email Kris at [email protected].

Hobbyworks does have a retail center where they can sell direct, but because they are the distributor the pricing will not likely be as attractive as what your local hobby dealer can offer you. So unless your parts need is urgent, please support your favorite dealer by having them contact the distributor.

I ran my engine in 90 deg weather Friday and the engine ran great all day at 225. :sneaky:

Flash light
 

I'm busy playing with batts right now:lol:

Must be nice. :nod: