ESE's works engine tuner

[TZ350]

..... 22psi could happen with an approx 6.5:1 comp ratio though a realistic figure for Avgas and efficient intercooling water injection and a Rootes blower.....If it could be engineered to stay together 40-45HP could happen, given enough time skill and and $.

A supercharged 100 has been an idea of mine for a while. I have been thinking of a Honda SL/XL/CB100 base engine with a XL185 or 200 cylinder and head.

The cylinder would be sleeved back with a wasted and "O" ringed Nickosil alloy liner and a jacket welded around the head fins for water cooling.

The supercharger would be independently driven and feed a large plenum, with fuel injection and digital ignition.

With the increased manifold pressure the engine would pull from down low and still rev right out on mild cams.

[marsheng]

Attachment 260508Attachment 260509Attachment 260510

What am I looking at ?

[Yow Ling]

A supercharged 100 has been an idea of mine for a while. I have been thinking of a Honda SL/XL/CB100 base engine with a XL185 or 200 cylinder and head.

The cylinder would be sleeved back with a wasted and "O" ringed Nickosil alloy liner and a jacket welded around the head fins for water cooling.

The supercharger would be independently driven and feed a large plenum, with fuel injection and digital ignition.

With the increased manifold pressure the engine would pull from down low and still rev right out on mild cams.

Would this suit the independently driven criteria?
http://books.google.co.nz/books?id=U...ustion&f=false

[Grumph]

What am I looking at ?

It would appear to be a two cylinder 125/250 yamaha....

As far as your independently driven blower goes, can i suggest that it be driven by oh, say, a 125 air cooled two stroke motor which you may just have lying around doing nothing....but it would have to be a bit more reliable.

Oh dear - we've come this far down this thread and here's the original poster revealing a fall back position consisting of building a FOUR STROKE.....

[Buckets4Me]

Oh dear - we've come this far down this thread and here's the original poster revealing a fall back position consisting of building a FOUR STROKE.....

thats his side chair project so many plans so little time

there was also talk of a 150cc 4 stroke at one stage twincam 4 valve 6 speed

but all this will have to wait till the gp is devloped into a reliable bike again (mine is 6 years old and still going)

[husaberg]

What am I looking at ?

A computer monitor screen?A assortment of Pixels?The picture of Miranda Kerr? Speedpros pics of his half an FZR? The mock up i did when i was bored. All of the above?

[husaberg]

A supercharged 100 has been an idea of mine for a while. I have been thinking of a Honda SL/XL/CB100 base engine with a XL185 or 200 cylinder and head.

The cylinder would be sleeved back with a wasted and "O" ringed Nickosil alloy liner and a jacket welded around the head fins for water cooling.

The supercharger would be independently driven and feed a large plenum, with fuel injection and digital ignition.

With the increased manifold pressure the engine would pull from down low and still rev right out on mild cams.

PS with a pitot tube CV carbs will work, they are clever like that. Not as good as EFI but doable blowthrough.

This is the Tramontana (attached below)
Russell Savory (Weird i always thought it was Savoy) RS developments.
I do have another article pretty much the same Cathcart was a but of a story whore like that.
I remember an article on a superchargered Manx norton in a 500cc Cooper. It had from memory a 6 foot long inlet to serve as a plenum.

Anyway back to 2 strokes
Can you see Wob what the diff is between the gudgeon height on the CR80 50mm piston and the std NSR is?
i had a look and it looked like it was nearly 6mm surely not?



Wössner Forged piston fitting Honda NSR & CRM 125R 1991-2003
The flask is available in five sizes, from standard to maximum TDC.
53.94 53.95 53.96 54.44 54.94 mm.
Height total of 64.40 mm.
Height to the piston edge 62.00 mm
Center piston pin to piston top edge of 30.00 mm.
Center piston pin to the lower piston edge 32.00
Piston Bolt Dimensions 16 x 45 mm.
Two chromemolyringar height of 1 mm.
Piston Ring Locking at 5 o'clock and 7th


Cannon Piston for Honda CR-80 Years 86-02.
The piston comes in two tolerances for bore 46 mm.
Fitting 79 cc engine.
Overall Height 53.25 mm.
Height to the piston edge 51.10 mm.
Center piston pin piston top edge of 24.10 mm.
Center piston pin lower piston edge 27.00 mm.
A piston ring chrome molybdenum 1.00 mm
Piston ring lock 150 degrees from the exhaust port at 5 am.
Piston Bolt 14 x 38.90 mm.

[2T Institute]

Attachment 260502

The sized piston from the Taupo GP.

Attachment 260499

On over rev, close but not touching.

Attachment 260501

Not so hot that it has coloured the underside of the piston crown, so not overheated. My pick is it needs a touch more clearance.

Attachment 260500

I think that the top edge and ring grove have been pushed up by the lower edge of the exhaust port, or hammered in as the piston rockes over and slaps the cylinder wall.

Attachment 260504

The Honda RS piston shows some of the same signs too.

Attachment 260498

This new Yamaha 90-93 YZ125 piston has a grove under the ring land. Whether that is to over come the ring jamming problem or for something else I am not sure.

I see the piston has the old Wiseco logo (a W in a oval) I always bake these at 200deg C before the cylinders rebored or honed. Whilst not the best heat cycling better to find out if they are going to grow then than in the cylinder. They have a bad reputation for that. The later pistons appear to be fine(with the square logo on the box). RS125 manual recommends to V the ring groove in front of the exhaust port to stop the stuck ring problem. The 0.7mm ring fixes that better than the V.

[dinamik2t]

Wössner Forged piston fitting Honda NSR & CRM 125R 1991-2003
Height total of 64.40 mm.
Height to the piston edge 62.00 mm
Center piston pin to piston top edge of 30.00 mm.


Cannon Piston for Honda CR-80 Years 86-02.
Height to the piston edge 51.10 mm.
Center piston pin piston top edge of 24.10 mm

I think that when undersizing the bore with a smaller piston, the number you should pay more attention to is the overall height. While you can rise piston position into the cylinder with a longer rod and/or base plate, if total H is less than the distance from deck to ex. floor (stroke+deck?), then ... Houston, we have a problem!

[husaberg]

I think that when undersizing the bore with a smaller piston, the number you should pay more attention to is the overall height. While you can rise piston position into the cylinder with a longer rod and/or base plate, if total H is less than the distance from deck to ex. floor (stroke+deck?), then ... Houston, we have a problem!

Destroke as well as debore remenber i haven't got to the skirt yet.is that what you are meaning? total h? but yeah big diff there. but the cr ran a fairly long stroke.

[wobbly]

The +3mm CR85 pistons I have here are just over 51mm skirt ( so fine for a 50.6 stroke ) with a 24mm pin bore to timing edge.
Gives plenty of room for the long rod.

[teriks]

Just found this - BEMP figures !!!!

'Here in Brazil our preferred engine for drag racing is the VW ABA 4cyl 2.0 Liters and I've got 1180 Hp on this little sport compact machine with just 3.6 bar intake pressure.'

Well maybe it's time to revisit a 100cc and supercharger.

How about a single cylinder of a BRM V16? Ends up at ~94cc and around 37hp at 12kRPM and 5.7bar boost, should be cheap end dead reliable :P
One of few four-stroke engine noices that can compete with a full blown two-stroke in my ears: http://gpl.krej.cz/mp3.html

[F5 Dave]

oh well, 1/2 your luck TZ. I found cracks on the underside of the piston on both guneon pin bosses.

Also the thrust washer on one side of the crank has a bend in it?!? Not sure how that happened! Hmm, maybe when the last piston exploded & I didn't notice (or look that closely it has to be said).

[jasonu]

Attachment 260508Attachment 260509Attachment 260510

Coor Mike, that old chestnut...

[TZ350]

Measured up the cylinder and sized piston.

Old sized piston has 0.006"clearance new piston has 0.003" as per Wiseco recomendations.

The old piston also had 0.003" clearance when it started out.



Even though the underside of the crown is not showing signs of overheating there is some thought that 34 crank hp may be more than the thermal limit of the air cooled GP engine.

Anyway I have been talking with the ex ACL engine man and he wan'ts to see some pictures.



Not to hard to clean the alloy off the bore.