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| What octane to run? https://hpbc.ca/viewtopic.php?f=19&t=3962 |
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| Author: | Arltralite [ May 23rd, 2018, 9:51 pm ] |
| Post subject: | What octane to run? |
Looking for input on fuel to run in the 30 hp (31.8cu in) motor that I have been piecing together. It’s been slow going. Parts are not as interchangeable as I thought. I had the block oversized 0.030” No other mods to the block. I have played with some heads. A stock head on a standard bore block, yielded 120psi. 0.060” off a head and some clearancing got me to 135psi. I found a head from an old motor that had looked to have less cc’s but actually had more. Only made 115psi on my standard bore block. I planed a bunch off and made some clearance for the piston and got 145psi. When I put the head on to the 0.030” over block, the pistons hit. So I carved some more off the head and now I have 165psi. Do any of you run octane boosters or race fuel? Any timing suggestions welcome to. |
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| Author: | Culprit [ May 24th, 2018, 10:22 am ] |
| Post subject: | Re: What octane to run? |
does this motor have compression relief? |
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| Author: | sharpeye Mike [ May 24th, 2018, 7:03 pm ] |
| Post subject: | Re: What octane to run? |
All my 2 strokes gets Shell high test, no matter what compression. My 4 strokes gets all high test from what ever gas station I happen to stop to. |
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| Author: | BoomerMuskoka [ May 25th, 2018, 7:05 am ] |
| Post subject: | Re: What octane to run? |
i dont know much about 3 cylinders,, in my v6 165 would be too high compression to run 91. 100ll works... c12 is the awesome but probably wont need near that much octain with 165psi. |
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| Author: | Arltralite [ May 25th, 2018, 7:40 am ] |
| Post subject: | Re: What octane to run? |
Thanks everyone. There is no decompression on the motor. I always use shell premium in all my small engines. I have some 100ll I have a lot of friends that race dirt track, so may see about picking up a drum of fuel. Just not sure what blend. |
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