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GeminiCoupe
tinkerer
Joined: 10 Jan 2003
Posts: 172
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 Posted: Sun Feb 23, 2003 1:38 am Post subject: DOHC or SOHC? |
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Although its a while until i begin the planned engine swap on my coupe, seeing all these DOHC posts got me thinking. Would the DOHC be better to turbocharge or should i stick with a G180/200 SOHC? are twin cams really worth the effort? all these problems in sourcing parts posts are getting me worried.
cheers |
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Soop
backyard mechanic
Joined: 30 May 2002
Posts: 748
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| Posted: Sun Feb 23, 2003 6:20 am Post subject: Re: DOHC or SOHC? |
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As I said before the bores do get oval shaped from piston slap over the years so you would need to rebore and fit larger pistons.
Apart from that the other possible problem areas are gaskets, cams and heads.
I'd go SOHC personally, yet still even then you suffer from similar problems.
Ideally you'd want to slot a late model engine in there  |
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GeminiCoupe
tinkerer
Joined: 10 Jan 2003
Posts: 172
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| Posted: Sun Feb 23, 2003 12:28 pm Post subject: Re: DOHC or SOHC? |
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Im not particularly worried about the bores as i want to bore it out slightly, but what do u mean when u said problems with the cams and the head? my guess would be the head is prone to cracking or warping?
which engine would have more power potential when turbocharged?
cheers |
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Gene FJ20DET
hod rodder
Joined: 06 Oct 2001
Posts: 9163
Location: brisbane
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| Posted: Sun Feb 23, 2003 12:41 pm Post subject: Re: DOHC or SOHC? |
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talk to carlos about turboing (aka BlueTC)
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Soop
backyard mechanic
Joined: 30 May 2002
Posts: 748
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| Posted: Sun Feb 23, 2003 4:21 pm Post subject: Re: DOHC or SOHC? |
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| Nah, no problems like cracking or anything its just that heads are getting rare and with cams you may have to get them custom made, not 100% sure though. |
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rust3
backyard mechanic
Joined: 04 Feb 2002
Posts: 971
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| Posted: Sun Feb 23, 2003 5:06 pm Post subject: Re: DOHC or SOHC? |
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sprys green tg runs 10s SOHC
gold/green coupe runs 10s SOHC
denis mobbs red van runs 9s SOHC
red tg (lopsi) runs 11s SOHC
sohc are cappable of low times
quickest of them all CRZYFJ runs 9s (nissan engine)
havnt seen to many quick isuzu dohc |
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GeminiCoupe
tinkerer
Joined: 10 Jan 2003
Posts: 172
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| Posted: Sun Feb 23, 2003 11:37 pm Post subject: Re: DOHC or SOHC? |
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Yeah i know about the times the SOHCS are running, ive seen an injected SOCH G180 turbo run a 11.8. ->havnt seen to many quick isuzu dohc<- thats the whole purpose of the excersize  after seeing this at the bundoora car show today http://www.hotgemini.com/cgi-bin/gallery2.cgi?action=sc&vid=362&car=3 ive pretty much made up my mind...DOHC it is.
Cheers guys and thankz for the replys |
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rust3
backyard mechanic
Joined: 04 Feb 2002
Posts: 971
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| Posted: Mon Feb 24, 2003 11:12 pm Post subject: Re: DOHC or SOHC? |
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| ive seen one quick dohc. my mate has one in his zzz. puts out 250 hp at the rears and should be good for an 11 |
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