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#49673 - 08/08/01 12:02 AM Compression ratio in the V-6 X's
H_and_Ds_X Offline
Junior Member

Registered: 05/08/01
Posts: 5
I am wondering why Nissan uses a compression ratio of 8.9:1 in both the superchargered VG33E and the normally aspirated VG33E. Is it just an ease of manufacturing? Using a higher compression ratio in the non-supercharged V-6 would increase power and efficiency of the engine which would help the only weak link I have found on the X. If you know why they don't bump up the compression, let me in on the secret.

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#49674 - 08/08/01 12:04 AM Re: Compression ratio in the V-6 X's
H_and_Ds_X Offline
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Registered: 05/08/01
Posts: 5
That is if I'm not mistaken and they are both actually 8.9:1.

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#49675 - 08/08/01 03:13 AM Re: Compression ratio in the V-6 X's
XOC Offline
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Registered: 16/08/00
Posts: 17103
Loc: Minneapolis, MN
Quote:
Originally posted by H_and_Ds_X:
If you know why they don't bump up the compression, let me in on the secret.


Probably because the engine is 15 years old.

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Ian
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#49676 - 08/08/01 04:25 AM Re: Compression ratio in the V-6 X's
ElectroKen Offline
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Registered: 30/08/00
Posts: 1072
Loc: Shelton, CT
If the normally-aspirated VG33E had any higher compression it would almost certainly need premium fuel. People don't like hearing that these days unless they are buying something intended to be high performance. My '84 VF1100S has 10.5:1 compression and pings like mad on anything less than 92 octane.

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#49677 - 08/08/01 11:45 AM Re: Compression ratio in the V-6 X's
H_and_Ds_X Offline
Junior Member

Registered: 05/08/01
Posts: 5
Does the Frontier require more than unleaded regular to prevent pre-detonation?

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#49678 - 08/08/01 11:46 AM Re: Compression ratio in the V-6 X's
OffroadX Offline
Member

Registered: 17/08/00
Posts: 13692
Loc: Baltimore, MD
Same engine. Nope. If it's supercharged, it will need premium though.

Brent
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#49679 - 09/08/01 03:23 PM Re: Compression ratio in the V-6 X's
*paul Offline
Member

Registered: 16/08/00
Posts: 822
Loc: New Zealand
Here's a list of vehicle engines sold in the N. American market. That 8.9:1 seems to be about as low as it goes.

http://www.wardsauto.com/docs/Mahle2001.pdf
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-Paul
2007 Nissan X-Trail
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