1800 block with 2000 head

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MrToon
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Your car is a: 1978 CS1
Location: Belgium

1800 block with 2000 head

Postby MrToon » Mon Aug 07, 2017 4:55 am

My car came with a 1800 Lancia block, but 2000 cylinder head and pistons (with valve clearance). Does anyone know if it's possible to use this combination without losing too much compression? If so, should I get the head resurfaced and thus gain some more compression?

Thought of this only now when I'm ready to put it all back together, so hopefully someone comes to the rescue :D

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AndyVAS
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Your car is a: 1980 Fiat 124 Spider

Re: 1800 block with 2000 head

Postby AndyVAS » Mon Aug 07, 2017 8:04 am

It won't be much worse than a normal 1800 or 2000. You can do all the math for static compression pretty easy and the volumes of all the parts are out there with some searching. Rough guess off the top of my head, you will be 7.7-7.8:1. Should be able to run some truly cheap fuel.
Andy Phillips
Vick Auto - Technician, Performance Engine Builder & PFI Developer (with ITBs)
http://www.vickauto.com
Stock parts or Performance parts we've got what you need.

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davidbruce
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Your car is a: 1980 Spider 2000

Re: 1800 block with 2000 head

Postby davidbruce » Mon Aug 07, 2017 4:57 pm

I have read that the Fiat heads are thin at the block mating surface. And that you should only remove enough material to make a warped one flat. Don't remember the source but the recommendation was to deck the block not the head. Worth investigating.
Dave Kelly
Campbell River B.C.
1973 Sport(sold)
1980 Spider 2000(project, aren't they all)

narfire
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Joined: Sat Dec 27, 2008 2:14 am
Your car is a: 1980 124 spider
Location: Naramata B.C.

Re: 1800 block with 2000 head

Postby narfire » Tue Aug 08, 2017 12:18 am

I believe the 2L FI head is better than the 2L carb'd head. You can shave 10 thou off without problems ...if it hasn't been shaved before. I was told once when you are approaching 20 thou off ( max), you will have issues with the valve seats.
80 FI spider
72 work in progress
2017 Golf R ( APR Stg. 1)
2018 F350 crew long box

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kmead
Posts: 1069
Joined: Sat Aug 02, 2008 9:24 pm
Your car is a: 1969 850 SC 1970 124 SC 85 X19
Location: Grand Rapids, MI

Re: 1800 block with 2000 head

Postby kmead » Wed Aug 23, 2017 6:15 am

Shaving the head with normal pistons won't get you far and will just compromise the system if you need to service the head in the future.

Either go with the HC pistons or assemble as is.
Karl

1969 Fiat 850 Sports Coupe
1970 Fiat 124 Sports Coupe
1985 Bertone X1/9


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