Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Mechanical

Mechanical Mechanical Forum - spinning bits and gyrating bobs


Thanks Tree4Thanks
  • 1 Post By Taffy
  • 1 Post By Taffy
  • 2 Post By Dr_C
Reply
 
LinkBack Thread Tools Display Modes
July 1st, 2004, 09:06 AM   #1
Senior Member
 
Joined: Mar 2004
From: USA

Posts: 363
Thanks: 1

I Ride:
Head and valve to piston clearances? What's good?

Hi,
Just wondering what is a good piston to cylinder head clearance, and piston to valve clearance? And which cams offer the best valve clearances? ie. 01, 53, 55, 08, X1, X2, etc.

Also, what is the thickness difference between the thick and thin head gaskets offered for the 01-03 motors? The thin gasket is like 1.5mm.

thanks.
PowerFiend is offline  
 
July 1st, 2004, 09:40 AM   #2
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,100
Thanks: 337

I Ride:
powerfeind

i didn't know that there was a difference between head gaskets at all!

otherwise i may be of some use to you. the minimum clearance between head and piston is .040" or 1mm. mine is .046" (1.15mm) standard which is top stuff!

the piston to valve minimum is 1mm but on a big valve engine i would go for 1.5mm inlet and about 1.8 exhaust.

you will find that none of this matters however because the '01' and the '53' proved to have over 5mm in both sets of pockets. way more than enough! that means that the '55' will be the same for certain. but that's only certain in MY engine and not yours!

however by getting the timing a tooth out i somehow had valve bounce twice!?!? because i had the valve seats 'kissed' the valves had sunk .75mm into the head and the spring tension is some .75mm less or as lineweaver told me: about 13 lbs pressure. my dealer says the valve bounce is the valve timing being wrong but i've never heard of anything like it before! sounds crazy!!!!!

so i have had some shims made up which i collected this morning and we'll see if that makes a difference this sunday. i'll be putting one shim under each valve spring (metal) seat.

i cannot see how the other two cams will come a lot closer.

Taffy
Thanks from bushmechanic
Taffy is offline  
March 17th, 2016, 04:37 AM   #3
Junior Member
 
Joined: Mar 2015
From: Poland

Posts: 22
Thanks: 5

I Ride: FE 550 SM
Anyone knows what are the stock: valve to piston and cylinder head to piston clearances? 550 '07 engine.
gery is offline  
March 18th, 2016, 02:26 AM   #4
Senior Member
 
Joined: Nov 2001
From: Ely, England

Posts: 15,100
Thanks: 337

I Ride:
very big. 3+mm

regards

Taffy
Thanks from gery
Taffy is offline  
March 18th, 2016, 04:18 AM   #5
Senior Member
 
Dr_C's Avatar
 
Joined: Oct 2003
From: Sweden

Posts: 791
Thanks: 625

I Ride: Husaberg Supermono, Ducati 888sp5
I personally prefer somewhat larger clearance to the exhaust valves, like minimum 2,5mm. With a missed gear and maybe not so high spring pressures, itīs really easy for the piston to catch up with the exhaust valves and pay them a visit. With rocker arms some attention may also be spent on the radial clearance in deeper pockets as well (around 1,5mm and above is usually ok).
Thanks from bushmechanic and gery
Dr_C is offline  
March 18th, 2016, 04:42 AM   #6
Junior Member
 
Joined: Mar 2015
From: Poland

Posts: 22
Thanks: 5

I Ride: FE 550 SM
Thanks for the response.
gery is offline  
Reply

  Husaberg Forum > Mechanical and Technical > Mechanical

Tags
clearances, good, head, piston, valve



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Valve Clearances Wiggy Mechanical 5 April 28th, 2017 02:35 PM
Piston to Bore clearances 650 birdwoodburg Mechanical 11 February 21st, 2013 01:48 AM
Valve Clearances? space Mechanical 1 May 18th, 2007 02:52 PM
06Fe450e valve clearances? bigbob Mechanical 15 December 6th, 2005 03:09 AM
Tight Valve Clearances Scoobie Mechanical 10 June 9th, 2005 02:25 PM


Facebook Twitter Google+ RSS Feed