DieselBike.net

nice looking bike, I really like the style.

thundercougarfalconbird wrote:fixed as in non adjustable , need to build adjustable controler and adjust to where the engine runs its best

may be able to get a weaker spring in the vacuum dashpot to make it open sooner, then you can put a boost controller and turn it up from there.

albertaphil wrote:Hmmm, a fixed wastegate. As though every engine that particular turbo might be mounted on requires the same amount of maximum boost. I wonder psi the wadtegate is set for..
I wonder

WG set for 10psi

How much hp is that engine making at 2000 rpm?

belt driven s/c have a parasitic loss due to a belt drive a 10hp engine losses 2hp to gain 3 = 1hp gain?

That 10hp engine isnt flowing enough exhaust to get into the max turbine flow area, its not spinning the turbine fast enough to keep the wheel efficient. This turbo is made to flow up to 125hp so its like taking a turbo from a vehicle making 850hp and putting it on an engine making 100hp and wonderi...

I dont think the engine has enough heat energy to spin the turbine wheel fast enough causing the exhaust to be restrictive, like Ive said since the beggining of the post if you are not spinning the turbine wheel fast enough, each blade is acting like a wall holding back exhaust flow. Look how the tu...

Another question; since this turbo is effectively running off of heat energy, would increasing the exhaust temperature, per se, increase the turbo's efficiency? Is using a hotter burning fuel an option? Kerosene? Naptha? Mothballs? Yes, but I dont think you will ever get it into its efficiency rang...

By the way, so far I've tried changing the final drive a couple of times. 53mph seems to be the limit regardless if it is revved out in 5th or chugging along in 5th (or 4th for that matter). I would think the reason 53mph is the constant speed is because the engine is making close to the same hp at...

I think you meant the engine is too small to create enough heat energy for the turbo and I agree 100% I was just trying to clarify that the items you mentioned arent going to get his engine to spool the turbo any better. The engine is putting 8whp to the ground @3600 rpm and probably no more than 6w...

There is no need for an intercooler or internal mods for this application especially in 30f temps. I have 4 personal vehicles with homemade turbos and have turbo quite a few friends cars, My wifes car has stock internals running 7lbs boost for 142k miles My truck has stock internals running 7lbs and...

So in low and mid range, is it using the reed valve?

You still dont get it, just because it makes boost doesnt mean its in the efficiency range. It is lagging causing it to be restrictive , the intake plenum is big enough to flow 200hp to a 4 cylinder. Their is no need for a plenum like that and the reed cage is useless they have 1000hp 4 cylinder eng...

the ratio for the 94c /90 is 3.49-1 low and a .78-1 high so it has a pretty good overdrive.

I have the 94c 90d setup the driven is 10" dia. but just to add a little to my earlier statement just because yours had a larger driven doesnt mean much until you know the dia. of the drive in the lowest engagement, it would be nice if you could find info on the ratio range of your model.

CVT arrived in Tx at Curtis's place. They're a bit bigger than Comet units buttt......if the secondary/driven is larger diameter then should have a higher top range than the Comet's? Depends on the diameter that the primary starts and ends ,the belt starts on the top of the driven so chances are it...

I'll try putting things in perspective a bit. I've got a 75bhp diesel car engine (in my car) with turbo. And i think the turbo is about simular/smaller than yours. Whenever i want to get that max power from it it easily pushes the pressure to double that of the atmosphere (not comfortable with psi ...

The turbo is too big, not too small. Just because you have boost pressure doesnt mean its spinning fast enough to get out of lag. The engine cant even make the WG open, most engines could make 25-35lbs of boost when the turbo is sized properly and you use the WG to keep the boost at your desired lev...

gearhead1951 wrote:You COULD remove the turbine part and replace it with a pulley to make it an engine driven supercharger !

Solves most of the problems you are experiencing !

A turbo spins at over 100000rpm, it would be a fan . If you wanted to belt drive a smog pump would be better option

I dont think you need to be precise but the best chance you have at getting it to spool is to making the turbo manifold and charge pipe shorter. Yea it sounds like yours would be hard to take off in a church parking lot without completely smoking the tire down. The manual may be more fun but I doubt...

Another thing you may notice is most others with this single cyl. engine and turbo are running a CVT and can keep the rpms close to redline at all times.

Sounds like turbo lag to me, and since its a manual trans. that small engine may never be able to overcome the lag. I would try to reconfigure the turbo with a straight pipe into the intake and straight pipe out the turbine see what happens. Think of the "turbo manifold" you built as being...

http://www.ajdesigner.com/phpengine/eng ... ciency.php

How does it feel when its down one gear lower? Does the smoke clear up? Does it rev better?

try searching rbh3 rbh31 or rhf3 compressor map, should find some VE info . How many RPM is the engine turning when you were running 55mph?

Just looked at a pic of the turbo both sides are clockable but you would need to make it back to a bolt hole to keep the actuator rod straight.

I think its the compressor housing that is clockable on this turbo, their are four bolts with small tabs loosen tap the cover away from the CHRA and clock it, If I remember corectly you have to go atleast far enough to hit the next bolt hole if you are using the wastegate actuator but to be honest I...

You want the exhaust manifold to be as short as possible and dia. small enough to make the turbo spool, it uses heat energy. I wouldnt worry about making the gate open all the way, if your small engine ever gets to the 10lb gate open pressure all it takes is a tiny opening to keep it there. I was sa...

Is their any way to get a boost pressure reading at the plenum mounted to the engine? I dont see a need for an additional plenum with that length of charge. pipe. A turbo is a big restriction in the exhaust flow if the compressor side isnt getting the charge into the engine, it all has to work toget...

As far as the chain stretch goes an o-ring 530 chain with a tensioner should handle our dinky engines pretty well. I ride my mildly tweaked 115hp Bandit 1200 like a raped ape and get +10K out its o-ring 530 chain. The biggest mistake I made with chains in my youth was running them too tight. Also, ...

Anyways, I saw that comment about chain stretch and just couldn't let it go by. Sure, chain stretch is a potential issues, sort of. But the main incidence of chain stretch isn't from a chain just sitting there spinning between a couple of sprockets! No, it occurs with a moving swingarm, plus a CHAI...