ARNandal

Well...

Pulsar 200 and 220 share a same bore of 6.7cm,
while the P200 has 5.64cm stroke and the P220 has 6.24cm of it.

Now my question is

1. How would a pulsar 200 with the head of P220 behave?

> Loss in compression? What can be done to accommodate the loss
> any other

2. Can a p200 be a p220 with the head and connecting rod (gudgeon pin) change. Is that how the difference in stroke is achieved.

3. what is the piston size of p180 and p200, p220. [I suppose the piston size will be same for the p200 & p220]

4. What are the various upsizing options in boring, and what is the maximum recomended.

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Noor

Query approved

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kb100

answers in bold

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NANOtechnology

Yes, there will be loss in compression, you can bore the cylinder size to compensate the loss, but again even after doing this you will not achieve optimal performance as the diameter of the bowl will be shorter than the diameter of the cylinder bore.

To make it optimal, again you'll widen your bowl size thus decreasing the compression even further.
Which will pull you back to square one...

To make your bike a complete 220, you will have to change your crankshaft, the con-rod, the timing chain, the cylinder head, and (maybe) your block too.

I would personally recommend you to wait for a 4 valve p220 to come up, you can then swap your cylinder head with a 4 valve head which should give a remarkable increase in performance.
Besides, why are you soo keen on swapping the head, you can just bore your current cylinder and accommodate a bigger piston (if you can find one).

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ARNandal

Thankyou kb...

@NCG:

What maximum bore upsize, can we manage on the current head?

thankyou nano.

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kb100

which is the current head p180/200/220

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ARNandal

On the p220
how much of extra mm can be stretched.

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kb100

that will depend upon the thickness of the liner, i think joel has 230 cc kits for p220

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ARNandal

10cc increase is an increase in bore by 1.66mm of the p220.
There are riders here who have went for more mm, what is the maximum increase that would be possible as well as reliable on this p220 head?

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kb100

without knowing the thickness of the liner it is difficult to say that ,and you are right a lot of se asian guys have re sleeved the stock bores to higher capacity

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