Minimum clearance using standard cams??

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Abarthnorway - Remi L
Posts: 207
Joined: June 24th, 2006, 1:39 pm
Location: Oslo, Norway
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Minimum clearance using standard cams??

Post by Abarthnorway - Remi L »

Hi!


I am currently building a 130 tc engine using only std Fiat parts.
I am considering to narrow down running clearances on the cams, to gain some lift and duration.


How close may I go without sacrificing reliability?
What factors determines this`?
What are the potential drawbacks on having the valve slightly open during the slow opening/closing phase? (for 124 cam - see PDF)



For interest I am submitting a comparison graph for 130TC cams (high milage) and 1800 sport (low wear).
As You can see the opening (ramp) is very different between the two.

BTW - how do I submit the graph into the post - not as an attachment?


Best regards

Remi Lovhoiden
Attachments
Cams Abarth vs 1800.pdf
(191.89 KiB) Downloaded 391 times
Last edited by Abarthnorway - Remi L on October 13th, 2010, 1:21 pm, edited 2 times in total.
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Giulio
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Joined: June 22nd, 2010, 5:42 pm
Location: Turin, ITALY

Re: Minimum clearance using standard cams??

Post by Giulio »

Abarthnorway - Remi L wrote:...

BTW - how do I submit the graph into the post - not as an attachment?


Best regards

Remi Lovhoiden

Hi Remi,
you can simply open the pdf file, then use the Print/Stamp key ( or Alt + Print keys) on your keyboard to copy the entire desktop ( or only the selected window) as an image; then open for example Microsoft Paint ( or another graphic tool ) and paste the image !
Save and upload !

like this !
(I hope this is what you need.)

Bye

Giulio
Attachments
Immagine.JPG
Immagine.JPG (33.75 KiB) Viewed 4501 times
Abarthnorway - Remi L
Posts: 207
Joined: June 24th, 2006, 1:39 pm
Location: Oslo, Norway
Contact:

Re: Minimum clearance using standard cams??

Post by Abarthnorway - Remi L »

Thank You Giulio!!


Next time:-)


Remi Lovhoiden
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Guy Croft
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Location: Bedford, UK
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Re: Minimum clearance using standard cams??

Post by Guy Croft »

I use 16 thou" inlet and 18 thou" ex (+/- 2thou") as a rule on all the TC 8V cams, I would not advocate going any tighter.

GC
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