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 Post subject: Re: Singh grooves?
PostPosted: Sat Feb 03, 2018 10:32 am 
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Joined: Sun Sep 06, 2015 6:01 am
Posts: 296
Location: Metamora, MI
H1 heads are "cheap".
From the results, the engine does not detonate at same CR and timing. When will it ping? I do not know since it's beyond MBT already.

We did this at Roush (J.R.P.E.) to "ahem" take advantage. GTO engines only.(long b4 this hokie from who knows where)

cliff


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 Post subject: Re: Singh grooves?
PostPosted: Sat Feb 03, 2018 11:53 am 

Joined: Thu Jun 09, 2011 11:25 am
Posts: 3145
Some few production Yamaha TZ racer heads had a "trench cut" in them from the center of the chamber back into the squish area, with a rearward spark plug angle, only a very small improvement at best.


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