Tappet clearance?

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Leedy
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Tappet clearance?

Post by Leedy » Thu Sep 05, 2019 3:06 pm

A bit of advice needed from the tuning gurus.
I’ve just swapped my R20 cam in my head for an R23
Checked all the tappet clearances and they come up as
1 (inlet) 13 thou
2 (ex) 13 thou
3 (inlet). 13
4 (ex). 13
5 (inlet). 13
6 (ex). 13
7 (inlet). 13
8 (ex). 14
Will these be ok. Or do I need to get them smaller?
The book states
Rallye 12 inlet & 14 exhaust?
Been over 30 years since last shimming a cam up?

Thanks in advance
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Yoshie
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Re: Tappet clearance?

Post by Yoshie » Fri Sep 06, 2019 4:22 pm

Hi, if you have a look https://www.imps4ever.info/tech/camshaft.html it seems the exhausts ar OK but the inlets are on the wide side. Hope this helps.

Mike
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colin rooney
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Re: Tappet clearance?

Post by colin rooney » Fri Sep 06, 2019 7:21 pm

You should be looking for 6 to 8 and 13 to 15 , thats what i was running on my R23

col
Leedy
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Re: Tappet clearance?

Post by Leedy » Sat Sep 14, 2019 4:48 pm

I did think 6-8. As per the Haynes manual. But it also states 12-14 for the Rallye? Will do them at 6-8. Thanks guys. Much appreciated.
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Lotus-e-Clan
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Re: Tappet clearance?

Post by Lotus-e-Clan » Sat Sep 14, 2019 7:42 pm

All R series cams are 6 to 8 inlets and 12 to 14 exhaust - ie aim for 7 thou inlets, 13 thou Exhausts. :) Clan004
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