Lille-bror

Is this Martin Bayer running FX?

HomicidalBunny

iTrader: (4)

Are you asking if it's Martin Bayer or if it's an FX engine

DaRaceMasta

you know what he 's asking :P cheeeeekyyy lol

Lille-bror

Well, asking if its Bayers car. I can see its a FX

Graham11

iTrader: (22)

I dont believe thats his paint scheme...

occidio

FX vs Novarossi btt4

1. Fueleconomy?

2.Durability?

3. Stable and easy to ajust?

Hope someone has tried them both or another top nova at the same price

Eivind E

fx - short needle carb
nova - long needle carb
nova will have better fuel economy
durability, these are both good brands for quality

Personally I do not like short needle carbs.

Graham11

iTrader: (22)

I have not had a Btt4 but i have had Keep Offs and Bonitos... In my experience both the FX and Novas have great power. The FX has an extremely smooth powerband where as my Novas we either top or bottom. Durability? I havent had to do any maintenance on my FXs after 5 gallons but probably ready for a pinch but conrod is still fine. Ive never kept a Nova long enough to give a review of long term durability but I believe they actually suggest you change the conrod after break in in their manual but maybe not anymore.

The biggest difference for me was the ease of tuning and stability, my FX always starts right up and the tuning window is such that you can almost always have a good/decent tune as long as you are an hour or two but with the Novas the tuning window is so small that if you arent within a half hour of the sweet spot then the engine doesnt run its best and then has idle issues. I was always having to tune on my Novas and had issues with flame outs and either idle being too high or too low...

Again this is all my experience and opinion but I will never buy another Nova based engine... OS and FX only

Lille-bror

+100

Novas are really great engines but more sensitive to tuning. FX are MUCH more forgiving.The Nova conrod and crankpin haven't the best lifespan.

I would say mileage are similar between my FX and BTT engines (always +9 min).

I thought it was time to change the conrod on my preproduction FX after 3 gallons. When I got the new conrod, I could only measure a difference between the new and old in the range of 0.03 mm. Absolutely no wear on the crankpin.

Its very easy to setup a FX engine to your taste because it respons very well to venturies and pipes

Graham11

iTrader: (22)

so true about the conrod, i opened mine up to replace mine and when i measured it the old one was the exact same measurement as the new one but everyone said "oh well there may be stress fractures you cant see blah balh" so i replaced it anyway but i dont think it was necessary. After about 5-6 gallons I am sending my FX for its first pinch but I dont think it will need much else.

merdith6

iTrader: (3)

I own both an FX and a BTT and they both are easy to tune although the FX seems to be able to idle without loading up at all which I have never seen before.

The are both reliable no issues with either needed resizes at about the same time although the FX took a little longer to break in.

The FX has more bottom end and that is what I like and so I consider it a more all around engine although the smooth powerband of the btt and top speed help out on outdoor tracks. Fuel mileage I cant tell any difference.

Lille-bror

Novas just needs a hotter plug than #5 and #6 to stop load up.

merdith6

iTrader: (3)

I have been running novas since about 1998. If you run too hot of a plug you can burn the plug up very fast in a nova. When I said the FX does not load up I meant I can start it and not even rev it up and let it idle as I wait for my run. It's pretty awesome. I don't think either is better than the other just different.

Next-Level-Inc

iTrader: (10)

guys i have a brand new in box clocked fx 5k will let it go for 375 plus 10 shipping STEAL they are 370 stock!!!!!

Frank L

iTrader: (148)

I ran a 2058 on the fx engine this weekend. It is by far a much better choice than wither the 2108 or 2100. I don't think mileage is better but power delivery is far superior.