9.6 compression and boost
02-18-2016, 05:02 PM
#12
Yes, before running the E85 I put some in a large glass container, I threw in some braided line, some peices of aluminum and a couple O rings, left it sit for almost a year and couldn't find a problem with anything.
Last edited by GPM; 02-18-2016 at 05:08 PM.
02-18-2016, 05:03 PM
#13
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I'll be watching this, Im setting right around the same compression, I have a 4.5 cc dome on the pistons I could take off, but I'd rather leave the short block together
Last edited by F-2 Speedy; 02-18-2016 at 05:35 PM.
02-18-2016, 05:11 PM
#14
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I am watching this too. I always though of doing an e85 blower build and sounds like I have come to same conclusion as Rob did. Only thing I don't like is lack of availability. Only two stations in my are carry it at all. I think the low regular gas prices are about going to make e85 disappear.
But I love the idea of it! Proceed the tech discussion! I have been wondering on slightly higher static compression on a motor to be healthy NA for a while then add the boost. My next boat will have a plan along those lines.
But I love the idea of it! Proceed the tech discussion! I have been wondering on slightly higher static compression on a motor to be healthy NA for a while then add the boost. My next boat will have a plan along those lines.
02-18-2016, 05:22 PM
#17
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My most recent boat has 572 NA's with aluminum heads, and 9.6 compression ratio. Would like to discuss adding boost to these engines without lowering compression ratio, or using intercoolers so I can fit under the current blower scoops on the hatch. I guess my knee jerk reaction is 8-71's or a 10-71 if they would clear a distributor without an intercooler, and e85. Before everyone goes down the e85 and boats don't mix road, I have done a lot of research and let's just assume it's not a problem. I can't use centrifugal chargers because I have tall deck blocks, and there simply isn't room to build out, I have to build up. I can't afford new fuel injected whipples, so roots style it is. These motors make 650hp as NA's, and the goal would be 800-850hp. The only negative to e85 for me would be burning more of it, and availability of fuel when I leave my local stomping grounds. I could put a 100 gallon aux tank in the truck to combat some of that issue, but wondered if my goals could be reached on pump 93 fuel. I love being different and unique, and actually want to build e85 engines, but I am wondering if my goals could be made on 93 pump?
I would have no issues running a 10-71 on that combo, with around 9:1, and 5-6lbs of boost, and you should easily hit your goal, on pump gas as well.
02-18-2016, 05:56 PM
#18
Geronimo36
Gold Member
My only question about the E85 would be how much more fuel you'll burn compared to gasoline. The availability is a whole other story but if you can get it great. With this setup to make 800hp, I don't think you need the E85 do do it if you lower the CR a little bit with a head gasket. You can also open up the chambers a little.
02-18-2016, 07:54 PM
#19
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I did the same test as well but for almost two years with no ill effects either. Guys in the street seen have been running e85 and turbos for years with huge success. I can't believe it hasn't caught on in our hobby. Imagine 11.1 static compression and still being able to push 15-20 pounds of boost (that is a conservative number), all on pump fuel that is around a $1.25 a gallon at the moment. This is all done with the same tanks, pumps, and parts we use in the offshore world. As far as the "water" being such a huge problem, it's really not. Water is attracted no more to e85 than it is e10. And if your that worried about it you can put a ball valve on your tank vent lines and close them when the boat is not in use.
