Headwork first or pistons first?
Thread Starter
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Tourer
Joined: Jan 2011
Posts: 373
Likes: 27
From: Ontario
Headwork first or pistons first?
So do I get my heads done first or do I buy my pistons first?
Sorry if it's a dumb question , but I been learning a crazy amount talking to some reputable people here. So I'm trying to absorb as much as I can.
Sorry if it's a dumb question , but I been learning a crazy amount talking to some reputable people here. So I'm trying to absorb as much as I can.
Grand HDF Member
Joined: Oct 2009
Posts: 3,932
Likes: 882
From: SOON TO BE A SAFE AMERICA
BINGO!
Why go under the knife twice? If money is a issue. Wait till you have enough for both.
But, Your Bike Your Money...
YB
Thread Starter
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Tourer
Joined: Jan 2011
Posts: 373
Likes: 27
From: Ontario
Lol....no no no...not what I mean.
I have to order the pistons and send heads out
Question is what do I base it on...do I order pistons according to what specific work I'm doing to heads
Or
Do I request specific headwork based on what pistons I ordered etc
Either or I need 10.5:1 or 11:1 cr
Cruiser
Joined: Mar 2017
Posts: 123
Likes: 44
From: charleston wv
Lol....no no no...not what I mean.
I have to order the pistons and send heads out
Question is what do I base it on...do I order pistons according to what specific work I'm doing to heads
Or
Do I request specific headwork based on what pistons I ordered etc
Either or I need 10.5:1 or 11:1 cr
I have to order the pistons and send heads out
Question is what do I base it on...do I order pistons according to what specific work I'm doing to heads
Or
Do I request specific headwork based on what pistons I ordered etc
Either or I need 10.5:1 or 11:1 cr
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,596
From: san antonio
Cam first; then build around the cam. You could have heads done first, keep OEM chamber volume but equalize, have them machined for compression releases, etc. then select a cam and working with cam specs and chamber volume work out if pistons should be flat top or domed and if domed, how much dome. If the OP does heads/pistons without cam specs, cam selection will be limited.
Road Master
Joined: Jan 2020
Posts: 934
Likes: 1,050
From: So Calif
It is a symbiotic relationship. You need to talk with your head porter about the pistons. He will base the headwork on what you want to do. You want stock pistons, fine. You want high compression, domed pistons, fine.
The heads can be customized, the pistons so much.
The heads can be customized, the pistons so much.
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Grand HDF Member
Joined: Oct 2009
Posts: 3,932
Likes: 882
From: SOON TO BE A SAFE AMERICA
Lol....no no no...not what I mean.
I have to order the pistons and send heads out
Question is what do I base it on...do I order pistons according to what specific work I'm doing to heads
Or
Do I request specific headwork based on what pistons I ordered etc
Either or I need 10.5:1 or 11:1 cr
I have to order the pistons and send heads out
Question is what do I base it on...do I order pistons according to what specific work I'm doing to heads
Or
Do I request specific headwork based on what pistons I ordered etc
Either or I need 10.5:1 or 11:1 cr
Gotcha!
What part of the country are you from? Lots of great engine builders on this site and others around the US. Any Good Engine builder will direct you in the right direction.
Also what size motor currently?
* What DJL said makes sense as well.
YB
Seasoned HDF Member
Joined: Oct 2019
Posts: 10,584
Likes: 7,166
From: OH
Lol....no no no...not what I mean.
I have to order the pistons and send heads out
Question is what do I base it on...do I order pistons according to what specific work I'm doing to heads
Or
Do I request specific headwork based on what pistons I ordered etc
Either or I need 10.5:1 or 11:1 cr
I have to order the pistons and send heads out
Question is what do I base it on...do I order pistons according to what specific work I'm doing to heads
Or
Do I request specific headwork based on what pistons I ordered etc
Either or I need 10.5:1 or 11:1 cr
Last edited by eighteight; Jan 6, 2021 at 06:18 PM.
Thread Starter
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Tourer
Joined: Jan 2011
Posts: 373
Likes: 27
From: Ontario
Cam first; then build around the cam. You could have heads done first, keep OEM chamber volume but equalize, have them machined for compression releases, etc. then select a cam and working with cam specs and chamber volume work out if pistons should be flat top or domed and if domed, how much dome. If the OP does heads/pistons without cam specs, cam selection will be limited.
They were installed 6000k ago.
The heads I have are SE pro.performance 76cc
the heads are already machined for compression release valves
SE cam plateHydrolic tensioners
Rienhart 4" 2 into 1 exhaust
It's 2001 ultra stripped down just a little