grp rods
 

i have 2 new rods for sale in the fs thread tuned 21 and sport 21

last sunday was tuning for maxuim run time (.21 tuned version) was running a OS 2050 max run time was 8.5 minutes is that decent for a GRP?

no! is your track large and wide open or is it medium or small and tight? it also depends on your driving style! never heard of anyone running a 2050 with a tuned grp, so that could be the reason. try a dynamite 053, novarossi 9853, or the grp 2053 for fuel mileage.

yeah thats what I had wanted to give it a whirl what about a jp3 track in on the large side.

if anyone intersted i have tuned grp for sale in for sale thread
pm your email for pics

from my experience, the 2053 works well on the top and offers the best mileage. the 9853 or 053 provide more bottom end and a little less mileage. i chose the 053 for my local track thats on the smaller, tighter side of the scale. not a fan of the jp series of pipes!

Has any one tried an RB 2045? Ive got a dynamite 053 and a RB 2045 with 192mm header. Which pipe would give better fuel millage?

never tried the rb pipes.

grp
 

i used a os 2060 tuned pipe on my tuned 21 works great 053 works good also little more low end i didnt like the grp pipe at all i was getting 11 to 12 min in my losi truggy with a 7mm restrictor i tried all sorts of pipes and the 2060 was best by far smooth running hope this helps

Will give that a go

I just freshend up my buggy sport .21 GRP with a new tuned rod and tuned crank. Im goin to be using the 7mm restrictor, all i want is to be able to go 10min on a tank in my RC8B. Will the dynamite 053 give better runtime than the RB 2045? I think i was getting around 9:30 with the 053, non tuned rod and crank. I know runtime depends on so much more than just what pipe i run, but i think with a proper tune i should be able to go past 10min. I just want to see what kind of runtime i can get from this motor.

I noticed a hairline type fracture on the outside of the sleeve on my tuned .21(where it faces the crankcase not the piston). It is a very light fracture not much more than a scratch and it may have been there for 3 months or it could have happened yesterday. Not sure. But given the pressures and temps in that area kinda want to change it out. My questions -

1. I know the piston/sleeve for the tuned version is like hens teeth but is the P/S on the sport version identical?
2. Is the older Ninja P/S identical?
3. Has anyone found an alternative P/S yet?

It still has boatloads of compresson and has been such a great motor that i don't really want to just thrash it like it is and risk it going pop at an inopportune moment. Nor do I want to leave it on the shelf as a book end!

Your thoughts are appreciated.

Cheers, Mike.

I have two new tuned piston and sleeves in stock, let me know if you are interested.

I have a brand new sleeve (piston was damaged) I'd be willing to part with.

no more GRP!

Why is that?

We know Hyper:rolleyes:

They do still make plugs, so there may be a chance that they will make motors again. Then again, Mario Rossi did leave to another company.

The GRP factory burned down. There is a lot of controversy amongst racers of why the company burned down or what not. To make a long story short, GRP engines and parts are no longer being produced.

I know that much :) Still stuff out there though. I'm actually hoping to score another for the truck.

Oh, I thought you didn't know what happened. There are still entire engines out there. My local hobby store has two brand new in the box. The problem is, if by chance you have a rod break or something that is repairable, there are next to no parts out in the market.
That's the thing that turn so many people off from buying a GRP engine.

I need some help when I let off the gas it runs on as if the servo ain't closed but someone else told me my low end was too lean? Help !

Does this happen after a full throttle run? I had a similar issue at the end of the straight. The cause was a rich low end with a lean top end.

it's next to impossible to find parts, but the engines are still being sold! GRP factory burned down after it closed, hence the controversy! Prolly did it for insurance money! they were kind of problematic to tune, but were great when you got it right!

:tire:

How did you fix it ? How many turns should I swing for ? Thanks bud ! And yes its after the throttle is wide open and I left off for a double or whoops and I hear it run on !

Most likely you are running it to lean on the HSN.

What others call problematic is what I call precise. The GRP carb is the best out there, but takes some getting used to.

Ok ill richen it 2 hours ! What about the lsn ? Should I richen it? Or lean it out ? Thanks guys

Start by leaving the LSN where it is.

I'd do the same but I bet you'll end up leaning out the bottom as well (wont have any throttle response on the low end).

Thanks David, You got PM.

Mike.

Tuned P/S alternatives
 

Just want to give a bump up (and refresh some unaswered questions that TRArena asked some posts ago) about P/S sets aleternatives for the .21 tuned GRP.
Since i planned to completely renew this engine to use it as my jolly joker for some races (my actual picco does not perform as well as the GRP), i managed to find here in italy all the main spares (bearings, rod, pin, o-rings) bought from various sites, except for an original GRP P/S.

Instead i found availables some Ninja MR and Falcon piston-sleave sets and i want some credit that it'll be identical to the OEM GRP one. I compared the technical sheets of these engines and they are all the same.

I also wanted to give GRP a call but i found this thread and would appreciates infos from you well prepared guys. Thx

GRP Compatible...
 

Check out the following website...

tecnopower-motor.com

motor
 

i looked at the site but they dont have anything besides glow plugs

I've checked out too and glad to know obout a new engine manifactuer, but i did not undestand how Tecnopower is related to old GRP engines, even if I see a similar one on the home page.
It's not even a direct answer of my question about piston/sleave sets alternatives, as i only needed to know if Ninja MR's or Falcon B5's are the same as original GRP's ones.
Maybe it was an invitation to directly contact you tecnopower.....
Anyway just waiting for someone who has info about eventual differences between the ditto P/S sets.

Thanks again
Fabio

check the "about us" page at that site. They state that they manufactured the GRP. And, now they have formed Techno Power. Rody Roem (of RB Engines) is involved. I guess the question is...........will they make parts available for the previous GRPs?

Does anyone have a Ninja/GRP engine tooling kit they want to sell? Thanks!

I've been looking for one as well.

Noticed a couple piston/sleeves on carolinarc a couple weeks back; kicking myself for not ordering them now :(

grp
 

the only diffrence between the grp 21 and the grp based ninja 21 is the grp has a silicone filled crank ninja doesnt ninja has a little more agressive porting with more of a fang cut on the ports as the grp doesnt some of the early grps had the same porting as the ninja i think the early ones were left over ninja p/s they used up gor grp other wise every thing will fit each other dont know about the boss line up hope this helps same thing with the 28 engines also

Hi Guys,

Sorry not to be so reactive, but here some update. I have been quite busy to try and setup this new project manufacturing my own engines. Important to know that TecnoPower has NO connection whatsoever with GRP!

First challange was to get everything together again since when GRP burned, all the plans and many other things burned with it too, so we had to start from almost scratch..., except for some inventory left at their main supplier.

Our first challenge was to first reproduce the .21 buggy engine. We have started our production and can give you the following information about the spare-parts:

• The crankshaft Diam. 14mm/Stroke 16.80mm/Conrod pin 5.00mm
• Sleeve outside diam. 19.50/Piston 16.28mm
• Conrod for pin 5.00mm
• Main bearing 14x25.4
• Carburetor nek 15mm

I am sorry not to have all the knowledge of the whole line of engines GRP has produced before, but will try to answer the questions which are placed here.

For the US market, I am in contact with Mugen USA who can get spares and glowplugs when they want if needed.

Rody

grp
 

so are you guys making the copy of grp 21 engines dont quite understand are the rods going to be the same as far as the upper rod hole not having the brass bushing thanks for your time