what octane do i need?!?

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what octane do i need?!?

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what octane do i need?!? - 7/10/2007 2:12:36 PM

82_vette_600hp

Posts: 6
Joined: 7/7/2007
Status: offline

i am new to this whole forum thing so be kind to my "stupidity"
here is my problem i got an 383 strokerengine built by a guy in my area a few months back now i cant get ahold of him i think he moved out of state but thats not the problem.
i'm just now putting in the engine and had a couple of ?s on my mind like

what octane to run on this engine? and will it work on pump gas?
here is the build:
i was told the compression was 10.5:1 and it has aluminum heads
well here is a pic of the build paper

http://a910.ac-images.myspacecdn.com/images01/85/l_c5684fa5d3f5b4ae5436cfd094fd1d0d.jpg

sorry could not figure how to show it on here!!
i will be greatful for any help before i start it on pump gas

< Message edited by 82_vette_600hp -- 7/10/2007 2:20:51 PM >

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RE: what octane do i need?!? - 7/10/2007 5:53:08 PM

wrwalke

Posts: 385
Joined: 11/1/2005
Status: offline

Rule of thumb is that 10.5:1 compression is the absolute limit on pump 93. If it were me, I'd start with some boosted or mixed 97 or so and work my way down to 93. You'll want to keep an ear out for wierd sounds, early detonation, knocking, etc.. I would also invest in a lighted scope and keep an eye on the pistons (through the plug holes) for signs of scorching. Additives and race gas to mix in is cheap compared to burned pistons in your toy.

bill.

(in reply to 82_vette_600hp)

Post #: 2

RE: what octane do i need?!? - 7/10/2007 8:20:46 PM

73shark

Posts: 1097
Joined: 4/18/2006
Status: offline

Bill, can he back off the timing a few degrees and go with the 93 stuff?

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RE: what octane do i need?!? - 7/10/2007 8:27:44 PM

blknblu68

Posts: 207
Joined: 4/4/2007
Status: offline

i have a similar engine in my chevelle with iron heads and have run it on 93 since new 10 yrs ago. no issues!!
just use good stuff like amaco gold or shell stay the hell away from caseys etc...!!! LOL

(in reply to 73shark)

Post #: 4

RE: what octane do i need?!? - 7/14/2007 10:25:58 AM

82_vette_600hp

Posts: 6
Joined: 7/7/2007
Status: offline

ok so i can run the engine on 93 octane
what about octane booster you know the "autozone" stuff that says "offroad use only"

(in reply to 82_vette_600hp)

Post #: 5

RE: what octane do i need?!? - 7/14/2007 4:25:08 PM

cwb

Posts: 1508
Joined: 5/13/2007
From: eastern NC
Status: offline

quote:

ORIGINAL: 73shark

Bill, can he back off the timing a few degrees and go with the 93 stuff?

This is the best call here.

Where's the 600 horses from? Blower? 3 dueces? Twin 4's?

That's alot of power from a 383 twister and only 10.5:1 squeeze...

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Post #: 6

RE: what octane do i need?!? - 7/15/2007 6:00:23 PM

wrwalke

Posts: 385
Joined: 11/1/2005
Status: offline

Octane is octane... it is a petroleum fuel property that describes the combustion point. You can have it added by the gas company, or add some in yourself from a bottle. The result should be the same. Personally, I would buy good pump gas and add some from a bottle to get up around 96-97 if you want to go burn off some tires some weekend. For just plain cruising around town and occasionally showing off, I'd drop the timing a tad and stick with pump 93. Nice to have the choice...

bill.

(in reply to cwb)

Post #: 7