Safe to boost on 86mm bore?
#1
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Safe to boost on 86mm bore?
Anyone have an comments or experience in boosting on a GEM sleeved b18b block w/ an 86mm bore? I know it starts to get real thin between cylinders so you guys think I'll just keep blowin headgaskets?
Thanks
Thanks
#2
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Re: Safe to boost on 86mm bore? (Vadian)
I want to say no, since I don't know anyone running that big of a bore and boost.
Is it Oringed or step decked? I'm assuming probably not.
Is it Oringed or step decked? I'm assuming probably not.
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Re: Safe to boost on 86mm bore? (98CTRCoupe)
I don't think you will have enough surface between the bores for a gasket to hold, Plus the bores would be very thin.
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Re: Safe to boost on 86mm bore? (98CTRCoupe)
Neither O-ringed or step decked... Should I send it back to GEM and get it o-ringed to help out a little?
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Re: Safe to boost on 86mm bore? (rOby)
i think you can run arond 5-7 pounds on the 86mm bore but its still thin. Should make some crzy torque with that setup.
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#8
Re: Safe to boost on 86mm bore? (jinxproof99)
Use ALOT of copper spray... Just kidding.
I'd probably go all-motor with that block.. How about you sell it to me? And ill give you my b18c1 as a core return? lol
I'd probably go all-motor with that block.. How about you sell it to me? And ill give you my b18c1 as a core return? lol
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Re: Safe to boost on 86mm bore? (jinxproof99)
I planned on boosting at 85mm but I dropped 2 valves (REV stainless steel) the other day and scratched up the sleeves...it isn't real deep and I think I can get away with 85.5mm but I'm not sure yet..
Here's some pics..
Anybody want a custom made JE Piston? :doh:
..and for the best part...
Now whats gets me is what caused this..
I was accelerating w/ approx 60% throttle and at about 30mph in second gear that happened...I didn't jump timing, I wasn't detonating...
I did put 100shot on it for 7-8 runs with 100octane (9:1 C/R) and only detonated once but that was 2 weeks before this..
I think the valves just got weak after a few thousand miles cause where the rocker arm meets the tip of the valve, they looked crushed and I adjusted the valves every oil change.. I'll get some pics of that later..
[Modified by Vadian, 7:09 PM 1/29/2003]
Here's some pics..
Anybody want a custom made JE Piston? :doh:
..and for the best part...
Now whats gets me is what caused this..
I was accelerating w/ approx 60% throttle and at about 30mph in second gear that happened...I didn't jump timing, I wasn't detonating...
I did put 100shot on it for 7-8 runs with 100octane (9:1 C/R) and only detonated once but that was 2 weeks before this..
I think the valves just got weak after a few thousand miles cause where the rocker arm meets the tip of the valve, they looked crushed and I adjusted the valves every oil change.. I'll get some pics of that later..
[Modified by Vadian, 7:09 PM 1/29/2003]
#10
Re: Safe to boost on 86mm bore? (Vadian)
I had an 86mm bore gsr block for a while and I would not suggest boosting it. It is also impossible to oring that big a bore. there is not enough room between the cylinders to even fit two thicknesses of the wire. Plus GEM told me they cant oring it.
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Re: Safe to boost on 86mm bore? (DLB1994)
hey highbrid: you only ran a 13.3 on slicks with 310whp in a HB
as for 86mm bore, with a cast iron sleeve. i say go for it and let us know how it works.
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Re: Safe to boost on 86mm bore? (DIRep)
Yeah, I'm give it a try.. hopefully I can go 85.5 but if 86, then so be it. Besides, as long as its tuned well, whats the worst that could happen besides blowing headgaskets?
I'm lookin for someone who has already done it.
Is there anyone or do I get the honor of being the first?
I'm lookin for someone who has already done it.
Is there anyone or do I get the honor of being the first?
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