I am curious about this as well. I plan on buying the Mantra and I have this pipe and header on hand.

Can anyone tell me if the gap between the header and exhaust gasket is too much? The exhaust hanger that came with my kit is a little on the short side for this pipe/header combo. Just wondering if this is enough to cause a leak.

I am using the 9901/31, but I am not getting 10 min stops. Now, I drive a little punched and my engine is not broken in yet. I am told the 2096/31 makes the most power and the 9901 should get a little better fuel economy.

Hello Cardiak,

I suggest You to find a longer Exhaust hanger. If You run Your Car with the manifold position like in the picture, I would say that the gasket will ruin prematurely and it will cause leaking.

Cheers..

That spring on that postion does moet give a strong tight connection. Pop the spring over the small engine side hole so it will fall in a groove of the wider engine cooling fins. And with Novarossi springs it is wise to use a 2nd spring...

Probably then the gap at the manifold is gone.

Because you did install all new, there is a chance the silicone rubber is not seated well creating the gap. With new rubbers it is wise to use some oil to mount the manifold.

I use 2 springs on my Nova 28-8 (41017 manifold and 9886ss pipe) and I custom bend my hangers as to not put any stress on the exhaust or cause any movement once tightened down. I always install the exhaust, use 2 springs, and find the point where the exhaust is square and tight. Then mess with the hanger to keep it right there.

Cardiak’s kit came with a hanger that needs to be tweaked a little bit to fit just right. I don’t think he will need to make a new hanger.

Here’s my 28-8RT with the dual springs on the manifold.

The 10 minute pit stop is something that requires much more than just engine/exaust combos. The track layout, drivetrain, temperature, throttle finger and clutch all play a huge role in fuel consumption. Plus it’s my personal belief that I would rather have an engine setup that feels great to me as long as it can make 8 minutes compared to one that makes 10 minutes but doesn’t have the drive I want. Also the 9901 make more power on all nova headers except the 41021.

It looks like you need a longer hanger for the pipe, piano wire, wire coat hanger work fine and (depending on diameter) bend easy

Can someone share their needle settings for a Mito 4? Thanks!

Question for the motor guru's. Fellas I have the mantra, 1 race and the front shield on the dual shielded front bearing came off! Not sure why. But will this cause a air leak even tho the bearing is dual sealed? Part # 17011

It will not leak. The crankcase seal is formed by the oil film between the crankshaft itself and the crankcase. As long as the bearing is tight, there’s nothing to worry about really, other than dirt being able to get into the bearing... I’d just put the shield back in. They pop in and out easily.

Aight next question , So I had already changed the bearing just because the shield issue. Also 2weeks ago I could not keep the motor lit with the bearing with the bad shield and a #6 plug!! Tried new plug nothing worked! So i blamed it on the front bearing! Because this was the # plug that the motor came with n the plug I ran the 1st race with.......fast forward to yesterday changed bearing and put in a #5 plug suggested by a motor guy. Fire it up! Running just perfect now! So now I'm not sure if the bearing fixed the issue or the plug! Have you guys seen nova engines that just want a #5 vs a #6 plug?

From a mechanical standpoint, the bearing isn’t going to make a difference on how the engine runs if the bearings are tight. If there is slack in the bearing that allows the crank to “wobble” in the crankcase a little bit, it will wallow out the crankcase a little bit and this will cause a leak if the fuel mixture isn’t rich enough or there’s not enough oil present to fill in the “void” between case and crank.

Generally, you choose the glow plug heat range for the fuel and stick with that plug unless you change fuels (with more or less Nitro). However, sometimes colder weather may require a hotter plug (hot body plug with the same filament as old plug) and hotter weather may require a colder bodied plug. Hot body plugs retain more heat and vice versa for cold body plugs.

Since i have been running novas, I only run the C5TGN plug. Made for all temps, never had an issue. I am running my 4th nova motor, plug runs all weather conditions. Easy to tune.