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Apr 16, 2014 | 11:20 AM

aposto

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From: MASS

piston

thinking about upgrading my 88 to 95. want to run andrews 37 they say they should run 9.7 - 9.8.1 compression. would wiseco domed pistons fit with the stock heads. that would bring it up to 9.5.1 then use 030 gasket should get me close to the compression i want. the bike is a 06 streetglide

Apr 16, 2014 | 02:24 PM

djl

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From: san antonio

Depends on the dome volume and the chamber volume. Best to CC the head and use a compression calculator to figure out what you need to do. Most TC heads will run 85-86cc but I have seen them measure 89-90cc. Using domes and maintaining chamber volume is a better approach to set compression than using flat top pistons and cutting .060".

Apr 16, 2014 | 09:19 PM

magnum629c

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From: redbank new Jersey

From what I here its best to run flat tops pistons.. I would send ur jugs to to big Boyz and have them bored out for 150$ new pistons 200$ and have him port the heads 300$ and for 70$ he decks the heads and u can set settle compression anywhere u want. The hole job would run u around 700$

Apr 17, 2014 | 05:21 AM

Hillsidecycle.com

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Quote:

Originally Posted by aposto

We have a good client in Worcester, that we set up with a 37 last year.
Our Stage II Heads/10.0 cr/98"/51 HPI/Bassani 2 into 1/tuned at a shop in Manchester, NH.........108/112, sae.
Andrews wants to see the dyno report........I need to get that over to them sometime.
Scott

Apr 17, 2014 | 09:30 AM

djl

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From: san antonio

Quote:

Originally Posted by magnum629c

Using flat top pistons is one way to get there but requires that chamber volume to be reduced to 76cc; a .050" cut on the heads, to set CR at 10:1 per Scott's example in his post. That deep a cut can make intake manifold alignment difficult as well as render the heads useless in the future for a different cam set. Working the heads and ending up with say an 88cc-90cc chamber and a domed piston does not affect intake manifold alignment and makes the heads useable in the future with different cam sets which also makes that heads more attractive to a future buyer as he will not be limited in cam choices.

Last edited by djl; Apr 17, 2014 at 09:33 AM.

Apr 17, 2014 | 01:36 PM

fidel

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Joined: Jan 2010

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i just build mine i go with andrews 57 same as 37 more lift 10 to 1 comp
ported head 1.9 intake valve stock exhaust valve 98 ci supertrapp 2 in 1 20 disc closed end cap ist ignition ( carb bike ) not break yet but amasing change in power from 88 with 26 cam

Apr 18, 2014 | 05:03 AM

Hillsidecycle.com

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Want more lift?
We, at this time are setting up a 98"er, once again for a client from Mass.
Wood 408/ 10.6 cr/roller rockers/98"/our Stage III Super-Tour Heads/55 mm HPI.
Crank is pinned, and welded.
Gonna' be a beast.