Novarossi engines thread
#3436
Tech Initiate
Inserts
With the novarossi flash .21 it comes with two inserts 244R1 & 244R2, when would you use these as apposed to the one it comes with?
#3441
Hello,
Here are some pictures of the internal parts of FLASH .12 and 353S! The motors look from the outside practical the same but on the inside it's a different story! You have to look in detail, because the tiny changes make a big difference on this small engines.
Flash.12 parts are on the right side in the picture!
Cheers
Here are some pictures of the internal parts of FLASH .12 and 353S! The motors look from the outside practical the same but on the inside it's a different story! You have to look in detail, because the tiny changes make a big difference on this small engines.
Flash.12 parts are on the right side in the picture!
Cheers
Are the cranks different stokes? The first pic makes them look a little different. Outside of a little work(modding) on the crank they look very close.
#3442
See picture...
Cheers
#3443
It looks like the pin is lower on the flash crank. I can see the dremal job. I was more talking the rod pin placement on the crank.
#3444
Tech Initiate
The Sleeve,Conrod,Crankcase and Carb are different to the 353'09.
#3445
By
#3446
Optical grindings to make it look different does not say it will make a difference. The main difference must be found in the timings.
If the timing and messurements are the same as the older engine why not give it the same product number.
If the timing and messurements are the same as the older engine why not give it the same product number.
#3447
In a two stroke engine it’s all about the fuel/air mixture flow (laminar/turbulent or mixed) and to achieve the optimal flows it’s always in the inner parts shape. The different timings are achieved through different positions and dimensions of holes in the sleeve! There are some software’s to calculate the flow and optimizing it but in the end it’s always down to testing on the track.
The debate between engineers still continues regarding polishing or not polishing the inner parts of an engine. If you polish them you will have less inner friction and save some energy that is necessary to turn the engine. But on the other hand if you have a rougher surface the air and fuel will mix better and the mixture will burn more efficiently!
So if you polish parts in the inner of an engine you have to know which parts you have to polish to make a difference!
Cheers
The debate between engineers still continues regarding polishing or not polishing the inner parts of an engine. If you polish them you will have less inner friction and save some energy that is necessary to turn the engine. But on the other hand if you have a rougher surface the air and fuel will mix better and the mixture will burn more efficiently!
So if you polish parts in the inner of an engine you have to know which parts you have to polish to make a difference!
Cheers
#3448
Tech Elite
iTrader: (19)
In a two stroke engine it’s all about the fuel/air mixture flow (laminar/turbulent or mixed) and to achieve the optimal flows it’s always in the inner parts shape. The different timings are achieved through different positions and dimensions of holes in the sleeve! There are some software’s to calculate the flow and optimizing it but in the end it’s always down to testing on the track.
The debate between engineers still continues regarding polishing or not polishing the inner parts of an engine. If you polish them you will have less inner friction and save some energy that is necessary to turn the engine. But on the other hand if you have a rougher surface the air and fuel will mix better and the mixture will burn more efficiently!
So if you polish parts in the inner of an engine you have to know which parts you have to polish to make a difference!
Cheers
The debate between engineers still continues regarding polishing or not polishing the inner parts of an engine. If you polish them you will have less inner friction and save some energy that is necessary to turn the engine. But on the other hand if you have a rougher surface the air and fuel will mix better and the mixture will burn more efficiently!
So if you polish parts in the inner of an engine you have to know which parts you have to polish to make a difference!
Cheers
these are just my thaughts, but i have also put them into practice. with great results.
#3449
Hey Pattojnr,
You are right regarding the timing. I would be interested exactly what did you do and how did you know how much to change the ports in the sleeve?
Regarding the Crank I wouldn’t touch it, because the last action in the production process is balancing. So if you modifying it you can ruin the balance of the crank. The result can be shorter life time of the bearings or worse breaking of the bearings.
But anyway always when you tune an engine (assuming you are doing it right) you shorten its life time because you expose it to greater stress.
The power of engines in these days is way over what materials can handle! In the future the manufacturers don’t have many options to get more power. If they increase power with existing materials the life times of engines will be shorter and shorter. So the main point is to focus on stronger materials that are able to withstand more stress. But this will mean more costly engines for us.
By
You are right regarding the timing. I would be interested exactly what did you do and how did you know how much to change the ports in the sleeve?
Regarding the Crank I wouldn’t touch it, because the last action in the production process is balancing. So if you modifying it you can ruin the balance of the crank. The result can be shorter life time of the bearings or worse breaking of the bearings.
But anyway always when you tune an engine (assuming you are doing it right) you shorten its life time because you expose it to greater stress.
The power of engines in these days is way over what materials can handle! In the future the manufacturers don’t have many options to get more power. If they increase power with existing materials the life times of engines will be shorter and shorter. So the main point is to focus on stronger materials that are able to withstand more stress. But this will mean more costly engines for us.
By
#3450
Tech Elite
iTrader: (34)
The power of engines in these days is way over what materials can handle! In the future the manufacturers don’t have many options to get more power. If they increase power with existing materials the life times of engines will be shorter and shorter. So the main point is to focus on stronger materials that are able to withstand more stress. But this will mean more costly engines for us.
Unless you decrease the components weight, therefore less stress.