Author Topic: Montjuic or Alpino cylinder head  (Read 551 times)

Offline AndyB_11

  • Full Member
  • ***
  • Posts: 209
Montjuic or Alpino cylinder head
« on: June 13, 2020, 09:47 »
A complete one with valves, guides and seats in good condition would be nice but essentially I need a bare cylinder head that has no cracks, isn’t twisted and doesn’t have any fins broken off. I’ve got good valves, guides, seats and seals which I can fit in a day but my cylinder head is best described as tired.

The other option is a recommendation of somewhere (preferably in the UK) that would weld up a cracked area between one spark plug bore and 2 exhaust valve seats and then do the necessary machining of oversized valve seat inserts.

Offline The Sock

  • Full Member
  • ***
  • Posts: 186
  • '76 3cE, Owned from new.
Re: Montjuic or Alpino cylinder head
« Reply #1 on: June 13, 2020, 10:13 »
Keith Nairn at Laverda Scozia.
'76 3cE, owned since new.

Offline AndyB_11

  • Full Member
  • ***
  • Posts: 209
Re: Montjuic or Alpino cylinder head
« Reply #2 on: June 13, 2020, 10:26 »
That was my first port of call but he isn’t answering either email or phone attempts to contact him. I’ll be trying again but have to try other options.

Offline Vince

  • Hero Member
  • *****
  • Posts: 9065
Re: Montjuic or Alpino cylinder head
« Reply #3 on: June 13, 2020, 11:33 »
Piets Laser welding mate would be worth an inquiry. No heat distortion with the crack fixing

Offline montjuicharris

  • Newbie
  • *
  • Posts: 37
Re: Montjuic or Alpino cylinder head
« Reply #4 on: June 13, 2020, 14:19 »
Got a spare head here in Canada

Offline AndyB_11

  • Full Member
  • ***
  • Posts: 209
Re: Montjuic or Alpino cylinder head
« Reply #5 on: June 13, 2020, 14:24 »
Got a spare head here in Canada

Tell me more  :)

A replacement head that simply needs new guides, seats and seals would be the ideal solution.

Offline montjuicharris

  • Newbie
  • *
  • Posts: 37
Re: Montjuic or Alpino cylinder head
« Reply #6 on: June 13, 2020, 15:40 »
Just checked
I have a head with just the guides installed

Located Halifax NS

Offline AndyB_11

  • Full Member
  • ***
  • Posts: 209
Re: Montjuic or Alpino cylinder head
« Reply #7 on: June 13, 2020, 18:46 »
Well it’s job done. We’ve agreed a price for what looks to be a much nicer example of a  cylinder head than mine so the drama is over in under 12 hours.

Offline gareth99

  • Full Member
  • ***
  • Posts: 126
Re: Montjuic or Alpino cylinder head
« Reply #8 on: June 14, 2020, 18:49 »
If you need another one, let me know.... :-)
1925 Triumph Model P
1935 Triumph L2/1
1939 Triumph 3HW
1959 MV Agusta Ottantatre
1969 MV Agusta 350B  (race bike)
1979 Laverda Jotarama
1982 Honda CB1100RD
2000 MV Agusta 750 F4 S

Offline redax5

  • Administrator
  • Hero Member
  • *****
  • Posts: 4664
  • All 81's, a fine year indeed
Re: Montjuic or Alpino cylinder head
« Reply #9 on: June 14, 2020, 21:09 »
If you need another one, let me know.... :-)

Mike in WA needs one for his race engine Gareth
Redax Drilling Consultants, confirmed Laverda tragic's
near Brisbane, Australia

Offline Andy J

  • Sr. Member
  • ****
  • Posts: 321
Re: Montjuic or Alpino cylinder head
« Reply #10 on: June 15, 2020, 10:26 »
I’v got NOS 350 cylinder heads, but not sure how much work, if even possible, to make work on larger bore sizes.
An ‘inzane’ number of Zanes (all of which could run)
10 from Breganze (all of which can run)
Several other project bikes
1 x BMW C600 Sport Highline maxi scooter (for comfort and reliability)
1 x Benelli Tre Tornado 900 (cos it should have been the ‘new’ Jota)

Offline AndyB_11

  • Full Member
  • ***
  • Posts: 209
Re: Montjuic or Alpino cylinder head
« Reply #11 on: June 15, 2020, 11:23 »
I’v got NOS 350 cylinder heads, but not sure how much work, if even possible, to make work on larger bore sizes.

The valves are obviously bigger on the 500 but machining the head to take larger valve seats wouldn’t be too difficult, it’d be changes to the combustion chamber that’d be a bit problematic for someone like me to deal with, especially with high compression pistons.

Offline Grant

  • Hero Member
  • *****
  • Posts: 17357
Re: Montjuic or Alpino cylinder head
« Reply #12 on: June 15, 2020, 12:43 »
I think the ports are smaller too.
Check out my FB page, clublaverda.com

Offline Paul Marx

  • Hero Member
  • *****
  • Posts: 5748
Re: Montjuic or Alpino cylinder head
« Reply #13 on: June 15, 2020, 16:40 »
I'm not certain that there's a big difference between 350 and 500 cylinder heads castings.
A lot of people have done the conversion.
I only found 1 reference in the parts list.

Paul

Offline Andy J

  • Sr. Member
  • ****
  • Posts: 321
Re: Montjuic or Alpino cylinder head
« Reply #14 on: June 16, 2020, 23:42 »
I think the ports are smaller too.
Yep, certainly are, but that’s probably less of an issue.
An ‘inzane’ number of Zanes (all of which could run)
10 from Breganze (all of which can run)
Several other project bikes
1 x BMW C600 Sport Highline maxi scooter (for comfort and reliability)
1 x Benelli Tre Tornado 900 (cos it should have been the ‘new’ Jota)