Tapered Ring Compressors

[m4tti]

Does anyone have any ideas of where to source in the UK a tapered sleeve style ring compressor. Demon Tweeks does the Arp tapered compressor but not in 96mm. Wiseco do one but I cant find a UK supplier of that size, only smaller bike based piston.

The supply of tools like this in the UK does seem really limited in comparison to the US. Seems to be a dieing hobby over here.

Edited by m4tti on Wednesday 28th May 10:42

[m4tti]

Unfortunately neither Powerhouse or ARP make the correct 96mm size or its imperial equivalent. Ive only been able to find a Wiseco item so far.

Edited by m4tti on Wednesday 28th May 11:38

[m4tti]

That wont create a taper though.. have you used that method before.

The benefit of the purpose built device is that it has a coating to make the piston literally drop in under finger pressure with no damage to the ring.

[m4tti]

DVandrews said:

If you can find a 96mm liner you could easily make your own. There is a company called powerhouse who make them, a quick google or search of ebay might turn something up.

Dave

What did you have in mind to flare out the top of the liner?

[m4tti]

Snake the Sniper said:

Why does it need to taper? It might be the engine I'm used to, but all the compressors I've seen/used are straight sided......

It doesn't need to be tapered per say, but id quite like to use one on the bottom end I will be assembling shortly.

[m4tti]

DVandrews said:

The tapered type is simply like a solid tube, you never have to do it up or undo it, the piston slides down and as it does so the rings are compressed, the advantage is that it requires very little effort to fit the piston to the bore since the piston is not gripped, so it is unlikely that you would break a ring since you would feel the resistance if there were any misalignment, With a conventional ring compressor the piston is gripped quite tightly so that it requires a lot of effort to push the piston into the bore, if a ring offered resistance you wouldn't feel it and could easily break it.

I have made several at different sizes, the taper is made in a lathe and the bottom surface has an inverse chamfer to lock onto the top of the bore.

Faultless device that saves hours of faffing around.

Dave

Edited by DVandrews on Wednesday 28th May 17:28

Precisely, and exactly why I want one. The pistons can literally be pushed into the bore with finger pressure.

[m4tti]

They are pricey. The thing that's killing the prices Ive had from the states is the postage. Basically $50 for the compressor $50 for the postage.

My plan was to buy one and sell it on if/when I decide to sell the car.

[m4tti]

chippy348 said:

Give me the Wiseco part number and i will see what i can do for you, are you in a rush for it ?

Hi Paul thanks for the offer, have mailed you the part number.

[m4tti]

This looks like an interesting option..

A tapered and adjustable.

http://www.summitracing.com/parts/sme-90a3700

Compresses between 93.98mm and 97.790mm. So this would do it and have possible use on other engines.

Apparently can be delivered for £41.

Dave, do you see any issue in the adjustable design over the fixed one.

[m4tti]

The alternative is a fixed. Summit say they do a 3.780 inch (but the pic is showing a 3.77 which may be a cock up with their images. Thats 96.012mm.

Will 12 hundreth's of a mil show up when dropping them in.

http://www.summitracing.com/search/part-type/pisto...

Summit seem to have the most reasonable shipping rates

[m4tti]

Zombie said:

I've got a 93.0mm ARP which I use to fit pistons into a 92.8 - 98.9 bore. I've not had any issues with it. Last time the pistons were fitted with total seal rings too.

Was that a typo. Should 98.9 be 92.9.

Shame arp don't do a 96mm compressor.

[m4tti]

Mission accomplished. After phoning around the states and being informed that the Wiseco 96mm compressor was on back order till the end of July I largely gave up.

I found Cosworth supply the same type of compressor, but I had no reply mailing there sales team. I phoned a place listed as a Cosworth Distributor, although he had no cosworth compressors he did have this Company was www.part-box.com

[m4tti]

Zombie said:

Glad you got it sorted. They are worth the money. I am curious though, 96mm is a hefty bore size, what are you building?

Tvr speed six

Will try and get some end pics up tomorrow.

[m4tti]

226bhp said:

Result.

Can you get a pic of the other end so I can see the detail please?

Heres the top looking down..



Heres the bottom that will mate with the bore..




And heres a side profile looking at the bottom face again



Hope that helps.

[m4tti]

I'm still waiting for my block to be delivered, but I'm also curious as to how this is going to align with the bores. The lip machined into the face of the compressor could mate but it will depend on how the liner is set in the block... otherwise I'll need to line it up with some laser eyeballs.

Saying that it should be no more difficult to line up than standard. Remember Dave was talking about a compressor he machines.