Exhaust
 

Does anyone know how well the Picco/IDM 2033 pipe with it's conical manifold works with a 35+21 Rex engine?
I'm running a 2052 pipe with the medium manifold on the 35+21 at the moment.

Has anyone ever gotten a 12-SCT engine to last 7 1/2 minutes on one tank?

I'm racing on a small/medium track that's pretty technical (therefore not too much time is spent on the throttle). My engine is way more than enough power for the track, losing power to accomplish the goal would be OK. I'm wondering if there's any chance I could get 7 1/2 minutes between the pits (race is normally 15 minutes).

My ideas:

- 16% fuel
- Novarossi exhaust cooling device
- Whatever pipe is most economical (would need to buy one)
- Smaller venturi

Think I have any chance at all?

at first i thought that you accomplicied the 7.5 mark:p and no i do not thing that you can make 7.5 min. in my track which is small to medium i make the most economy out of all the other drivers(i have the sct) and manage to do 6min and 20sec in cold weather conditions, i thing that at most you would reach the below 7min mark. but your steps are correct for making more run time

Thanks for the feedback. So which of these potential four fuel-saving steps are you already doing, if any?

The difference was the HOMOLOGATION of the engine, EFRA and non EFRA, this was for 2006 regulation,

have fun
ALG

well by ruel i have to use 16% and i use the gas cooler too. em as for the exaust i am using the 2630 which is not good in saving fuel. the one that saves fuel is the 2611 one. hope this helps

Well, I'm in need of a new pipe anyway so maybe I'll try that 2611. From what I can tell, RB and Sirio both make a 2611 right? And you think this 2611 has better mileage than the 2601, 2602, 2604, etc?

Only 16% or is it a maximum?
Just go down to 5% and use a nr 5 glowplug to keep the ignition right. Also play with a Team Orion CPD.

But do you think the lower laptimes can be compensatet by saving 1 fuelstop n 15 minutes racing ?

I read an article in rc extreme ( or rc car action ) long time ago. The article was talking about venturi size versus power & rpm. No venturi produce the highest rpm and the biggest venturi produce the lowest rpm ( less power ). At the end of story, Is this true ? Am I gaining advantage over my friends who doesn't know about the articles ( I mean I don't use venturi while others do ) ?

I had nationals last weekend, used my newly broken in SCT and had enough power to make best lap in our track which has 70m straight. It was with 2630 pipe, 6TGF plug, 18-22pinions and 59-53 spurs, yellow clutch shoe and mugen super hard spring on my NT1. It was no issue to keep up with most guys there, including some murnan modifieds. In the final, I was leading the race but had some problems with tires so finished 6th. Fuel mileage was 5m 15s.

Im totally satisfied with this engine, and no need to buy 2009 versions...

i am racing in national events where we are racing under efra rules i think. and the max % of nitro can be 16%.

Then you can use a lower percentage fuel.

Did you do a calculation?

You can do a pitstop in 6 seconds, that is what you will spare on 15 minutes. That is 0.4 sec a minute. Laptimes are 15 to 20 sec ?
You have to make a difference of about 0.1 sec a lap, slowing down your car to reach a 7.5 min fuelstop will cost you more than going on full power and make an extra stop.

Roelof, I'm the one asking about avoiding one of the pitstops in my 15 minute races. The thing you have to understand is that it's a small track with lots of corners and very short acceleration time until the next corner.

Basically, the engine has waaaaay more than enough power for the track. So that got me thinking that maybe I could do thing like go down to 16% fuel, put in a venturi, etc, etc - and maybe just maybe it could all lead to me going 7.5 minutes on a tank and still have enough power for such a small track.

It's just club racing and I'm just experimenting and thinking out loud :)

haha this is a really big mix up:p

Hi guys,

what can be done to a Collari Cordoba engine to get as many revs as possible for extremely long straights (next 1/8 worlds track Lostallo Switzerland or Melzo Italy)? The engine runs very well on medium sized tracks with 0,6mm head gap (0,7mm shims) and a 7 plug.
I saw on the set-up sheets of some pros that they add 0,15mm of head shims for those circuits. Any thoughts?