HD6 to HD8 on 3.8 - worthwhile upgrade?

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ChrisDixon
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HD6 to HD8 on 3.8 - worthwhile upgrade?

Postby ChrisDixon » Fri Sep 29, 2017 3:18 pm

I've happened on a pair of HD8s plus manifold. For a 3.8 engine in standard tune, is it worth swapping out the HD6s? Has anyone done it to good effect? If so what needle did you use, and did you keep the AED or convert to a manual choke?
340jag
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Re: HD6 to HD8 on 3.8 - worthwhile upgrade?

Postby 340jag » Sat Sep 30, 2017 8:11 am

I don't think your notice much difference between the 6 and 8's !
ChrisDixon
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Re: HD6 to HD8 on 3.8 - worthwhile upgrade?

Postby ChrisDixon » Sun Oct 01, 2017 1:03 pm

I don't think your notice much difference between the 6 and 8's !
Maybe not, although I'd hope for a bit more top end. But maybe worth it to get rid of the ASC.
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piman
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Re: HD6 to HD8 on 3.8 - worthwhile upgrade?

Postby piman » Wed May 02, 2018 8:58 pm

Hello Chris,

that is something I intend to try on mine, although I was intending to install 9:1 pistons, a modified exhaust manifold and possibly hotter cams?

Alec
Mk 2 3.8 (long term restoration), MK1 Triumph 2.5 P.I. , 564 Hymer Motorhome
PPV

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Re: HD6 to HD8 on 3.8 - worthwhile upgrade?

Postby PPV » Thu May 03, 2018 9:51 am

I would not be convinced you would notice any difference in normal use of the car. A well set up HD6 works well if properly balanced and operational.
Regards,
Paul V
Mk2 3.8
Nissan Micra K13
Porsche Macan S
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