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Old 01-09-2012, 04:30 PM
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fueling the beast

Hi, I have a 1929 mercedes kit car,it has a sbf 438 stroker approx 650 hp with 13 to 1 comp, what can I do to mix a fuel for everyday street use that wont eat the pistons, and give pre ignition?

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Old 01-09-2012, 04:47 PM
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Nothing, you have a race car engine in a street driven car. You either run race gas or tear the engine down and get your compression down to a reasonable 9.5/10.0:1. This will also mean that you will have to install a new cam that will be compatible with the lower compression.....among other things.
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Old 01-09-2012, 05:06 PM
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Quote:
Originally Posted by hrl1929
Hi, I have a 1929 mercedes kit car,it has a sbf 438 stroker approx 650 hp with 13 to 1 comp, what can I do to mix a fuel for everyday street use that wont eat the pistons, and give pre ignition?
What Are you basing your comp. ratio on? Give us some info Head cc, - or + piston volume , head gasket bore and thickness, deck clearance, bore and stroke.

If your actually at 13 to 1 your going to have to mix racing fuel with racing fuel !! Im running Jahns forged 12 to 1 pistons to get 10.5 to 1 actual compression and my street fuel is 110 octane without my timeing cranked way back and my cam advanced!!

Jester
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Old 01-09-2012, 05:10 PM
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Quote:
Originally Posted by 327NUT
Nothing, you have a race car engine in a street driven car. You either run race gas or tear the engine down and get your compression down to a reasonable 9.5/10.0:1. This will also mean that you will have to install a new cam that will be compatible with the lower compression.....among other things.

I agree 500 percent with 327 nut you either miss calculated or have to rebuild to run a mix with pump gas!!!
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Old 01-09-2012, 07:51 PM
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Quote:
Originally Posted by hrl1929
Hi, I have a 1929 mercedes kit car,it has a sbf 438 stroker approx 650 hp with 13 to 1 comp, what can I do to mix a fuel for everyday street use that wont eat the pistons, and give pre ignition?
I can't imagine that type of kit car having that kind of engine in it. It looks like more of a cruiser than something that would have 650(!!!) naturally aspirated HP. Would take a loosey-goosey torque converter if it's an AT and short rear gears either way. Traction? Good luck w/that! Just seems like a mismatch to me, YMMV.

In any event, that much CR will take a minimum of 100 octane race fuel like Rockett, having aluminum heads will give you a little leeway but the tune needs to be spot on w/a good cooling system to boot. TOTAL TIMING IS CRITICAL as I'm sure you know.

Another option is to run E85. What fuel have you been using, or is this a fresh engine?
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Old 01-09-2012, 09:16 PM
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fresh

The engine is new I bought it for my race car but put it in the kit for a bit of fun. I was hoping to use avgas to offset the price of race fuel for a couple of runs to see how she likes the power and torque,I plan to build a much calmer engine for the car to use on the street. But it has to enjoy the beast for a while until I get the tbird finished.I know its not going to hook up very easy so i have done some chassis work to help that out. I also will try to get it to get it to stick on the track with a set of 10.5s by 28dia i'll just have to start softly. "like thats going to happen"
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Old 01-09-2012, 09:31 PM
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the beast

its a 438 dart shp block,srp 12.5-1 flat top pistons,4.125 bore4.1 stroke,6.2eagle hbeam rods,comp mechanical street roller cam rpm range 3200-7200,60cc pro comp heads 205 intake runners, no dyno run so just estimating.
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