4t tuning thread

[SS90]

Your not thinking and have run off at the mouth again..............

Now a turbo car engine does not have any problems slowing down quickly when the throttle is closed.

What car has a supercharger powered by a secondary power source?

[Kickaha]

you need to go back and read what he actually said and then think about the answers for a bit.......

Thougth about it, got it (I think)

Supercharger will supply constant boost no matter what the engine revs, blow off valve will vent under closed throttle

Wont that make the transition back to open throttle rather abrupt as you will have full boost as soon as the throttle is even slightly open or would the blow off valve regulate that?

I just wonder whether it might be a bit on/off with not much in between?

[bucketracer]

You are forgetting that this is a carbed engine.

Your just blurting again...........do you actually know how a blow through system works? can you explain it to us and how you think it wouldn't work in this situation.......bet you can't.....

[bucketracer]

What car has a supercharger powered by a secondary power source?

Can't you think of something original for yourself, why does it have to be a car?

[bucketracer]

Thougth about it, got it (I think)

Supercharger will supply constant boost no matter what the engine revs, blow off valve will vent under closed throttle

Wont that make the transition back to open throttle rather abrupt as you will have full boost as soon as the throttle is even slightly open or would the blow off valve regulate that?

I just wonder whether it might be a bit on/off with not much in between?

I think your concerns are valid......

After work tonight I will see what can be found on the net about blow through systems......

[SS90]

I think your concerns are valid......

After work tonight I will see what can be found on the net about blow through systems......

Bwahahahahahahhaha!

[SS90]

Can't you think of something original for yourself, why does it have to be a car?

You are the one who brought up references to cars.

OK, let's go for it, you explain (in your own words) how a blow through supercharger works, how you will fit it to a 99cc four stroke engine, and, how you can have it running at max rpm for the whole time.

[CookMySock]

What's going to happen when you go from full opened throttle to close throttle at the end of the straight, and your squirrels/ weed eater motor are still spinning flat out?

Your closed throttle won't slow your engine down with the blower maxed out, even if you have some type of clutch, the time delay between the clutch freewheeling, and the blower slowing down will be quite considerable, in terms of engine speed anyway.

I am very surprised to hear you say this.

From full revs and full throttle, when the throttle butterfly closes manifold pressure will drop and the (centrifugal) compressor moves from the choke region of its map to the surge region, along with the accompanying outlet flow reversal, and its' outlet pressure will tend to drop somewhat while the compressor rpm will increase - assuming a constant power input to the compressor.

Steve

[SS90]

It doesn't have a throttle butterfly Steve.

It has a slide.

How does the slide come down when you have so much boost?

Is it going to be injected?

Perhaps a dash pot carb?

I have seen a supercharged bike "not slowdown" before.

[avgas]

What car has a supercharger powered by a secondary power source?

None as its in-efficient (e.g. what goes in doesn't support the system). But it is not impossible. DC drive could power a supercharger for a short period (until the batteries go dead).
On a similar note there was a tuning shop in the 50's that had an interesting system

[bucketracer]

It doesn't have a throttle butterfly Steve.

It has a slide.

Who said........SS your presumptions are running away with you again

Engage brain.....read.....don't add what's not there and think before opening your mouth...

[SS90]

Y

The plan is a carb or injected blow through system.

You did. Please elaborate on your system. A hand drawn picture?

[NOID]

i have been looking into this turbo/ supercharged idea. from what i have read unless you run piss all boost theres a whole ton. of issues that arise with carbs . So i have been looking into an injected turbo set up, problem i am having is finding an engine/ecu combo that is cheap. i was thinking a new CBR125 would be the best base. Comes with fuel injection and is just begging for someone to remap/reflash or piggy back the ecu. . run a small turbo (charade, uno ) etc i could go on .

Then why just do one. Twin Charge ftw !!!!

[CookMySock]

It doesn't have a throttle butterfly Steve. It has a slide. How does the slide come down when you have so much boost?

I think you might be right.

The only thing returning that slide is the little spring on top of it. Enough boost will hold the slide up.

Just use a big Mikuni CV carb for that. Pipe the boost to above the diaphragm to equalise it, and use a pitot tube to the bowl for enrichening on-boost.

Steve

[SS90]

i have been looking into this turbo/ supercharged idea. from what i have read unless you run piss all boost theres a whole ton. of issues that arise with carbs . So i have been looking into an injected turbo set up, problem i am having is finding an engine/ecu combo that is cheap. i was thinking a new CBR125 would be the best base. Comes with fuel injection and is just begging for someone to remap/reflash or piggy back the ecu. . run a small turbo (charade, uno ) etc i could go on .

Then why just do one. Twin Charge ftw !!!!

That's the way I was thinking, Woodyracer has a FI CBR.

If Bucketracer was serious about the concept, I wonder if it possible to fit such a system (clearly from a wrecked CBR) onto an XL100 (or some such), I'm not so sure on the external power source, there are plenty of bikes with accessory/homemade super chargers.

Doesn't speedpro have something like a GSXR1100 that is supercharged?