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post #1 of 22 (permalink) Old 04-14-2019, 01:43 PM Thread Starter
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955 Sprint Head with Tiger Pistons

Doing a little research shows that an 03 ST and 06 955 Tiger have the same crankshaft but different pistons.
Does anyone know what the compression ratio would be if you use the stock Tiger pistons with a Sprint head?
I'm thinking of a possible mix and match motor but I may need to swap out the pistons as well.
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post #2 of 22 (permalink) Old 04-14-2019, 02:49 PM
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Did you cross post this to the Tiger group? You may get better answers since you're trying to swap into a Tiger

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post #3 of 22 (permalink) Old 04-14-2019, 03:05 PM
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The tiger is rated 11.6:1 while the sprint is rated 12:1. (Plus camshafts are different BTW).


Fred

Last edited by fredsprint; 04-14-2019 at 03:27 PM.
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post #4 of 22 (permalink) Old 04-14-2019, 03:59 PM Thread Starter
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Thank you, I know that part of it.
What I don't know is what kind of compression ratio I'll wind up with with the mismatched pistons and combustion chambers.
I don't want to build a grenade or wind up with a dog.

I'll try the Tiger Section as well, someone must have done this before.
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post #5 of 22 (permalink) Old 04-14-2019, 07:26 PM
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For the CR you need to measure how far in the barrel the pistons are and if the pistons are domed,dished or flat top. The closer to the deck they are the higher the CR. Donít forget the piston to valve clearance .

When all else fails, get a bigger hammer!
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post #6 of 22 (permalink) Old 04-14-2019, 07:47 PM Thread Starter
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I put an inquiry into Triumph America to see if anyone there would be able to give me a number, we'll see.
I'm pretty sure the thing to do is pistons/heads/cams/fuel rail/injectors.

It might be easier to just stick in the Sprint motor, change out the fuel rail and live with the up for first on the left hand side.
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post #7 of 22 (permalink) Old 04-14-2019, 10:36 PM
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Might be your best option bud

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post #8 of 22 (permalink) Old 04-15-2019, 07:49 AM
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I did the swap when the middle of a spark plug let go and fell into the cylinder head of my 99 Tiger. Made a hell of a mess. You get used to the race pattern 1 up 5 down gear change. Just remember head down to go fast, head up to slow down.

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post #9 of 22 (permalink) Old 04-15-2019, 02:01 PM
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Quote:
Originally Posted by Steve Ford View Post
Thank you, I know that part of it.
What I don't know is what kind of compression ratio I'll wind up with with the mismatched pistons and combustion chambers.
I don't want to build a grenade or wind up with a dog.

I'll try the Tiger Section as well, someone must have done this before.
Sorry Steve we misunderstand each other.

If the crank shaft is the same then the displacement is the same. So the only thing that changes is the piston. So if you put tiger pistons you'll get tiger ratio.


Does it sound reasonable or do I miss the obvious?

Edit: it seems that the obvious is that the head is not the same either .

Fred

Last edited by fredsprint; 04-15-2019 at 02:15 PM.
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post #10 of 22 (permalink) Old 04-15-2019, 05:49 PM Thread Starter
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You miss the obvious.
The question is what would the compression ratio be using Tiger pistons with a Sprint head?

Not Tiger piston/Tiger head
Not Sprint piston/Sprint head but
Tiger piston/Sprint head.

It doesn't appear as if anyone has the answer at hand SO I'm going to stick the Sprint motor in the Tiger and then pull apart/repair the Tiger motor and stick it on the bench for a rainy day.
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