3 cyl, 2 valve, scratch build
Moderator: Team
3 cyl, 2 valve, scratch build
Easy part is Buick Stg II V6 aluminum head fully ported. 2.15" Int., 1.56" ehx., Ti valves and Pankl rods. 4" coated bore, 3.2" stoke = 2L. Some webb
has flow #'s for this head, so I can extrapolate hp. ? ? Would like max hp. around 8,500. Electronic inj. with E85.
Suggestions ? Thanks, Art.
has flow #'s for this head, so I can extrapolate hp. ? ? Would like max hp. around 8,500. Electronic inj. with E85.
Suggestions ? Thanks, Art.
Re: 3 cyl, 2 valve, scratch build
Intended use?
IIRC, some at Bonneville running alcohol use billet blocks with no coolant.
IIRC, some at Bonneville running alcohol use billet blocks with no coolant.
Jack Vines
Studebaker-Packard V8 Limited
Obsolete Engineering
Studebaker-Packard V8 Limited
Obsolete Engineering
Re: 3 cyl, 2 valve, scratch build
Welded, 6061 T6. Very light recip. and crank. I suspect E85 won't cool like all that volume of methanol ? 90% street use. Small rad. and fan.
Would like to see about 200 hp. ?
Thanks, Art.
Would like to see about 200 hp. ?
Thanks, Art.
Re: 3 cyl, 2 valve, scratch build
Other part of cam design, with a 1.82/1 finger roller rocker ratio,( high loading on lobes), base circle should be approx. ?
Re: 3 cyl, 2 valve, scratch build
Art, suspect but verify.
Ethanol contains about 84,600 BTUs/gallon, which is about 27% less than gasoline, but about 30% more than methanol. Consequently, a race engine converted from methanol to ethanol typically uses less fuel (30 to 40% less) to make the same level of power. As an added benefit, the engine runs cooler and reduces the risk of overheating.
Jack Vines
Studebaker-Packard V8 Limited
Obsolete Engineering
Studebaker-Packard V8 Limited
Obsolete Engineering
Re: 3 cyl, 2 valve, scratch build
If you want rules of thumb, 0.257 x cfm x #cyls= potential hp.
Want another one? Max effort race engine will make 1.6 lb ft torque/cu in. Very hot street engine will make 1.4 lb ft torque/cu in.
If your engine is 120 cu in and the head flows 300 cfm, potential hp is about 230hp with peak torque of 190 lb ft if a max effort unrestricted race engine. If you add various rules, adjust downward as necessary.
Want another one? Max effort race engine will make 1.6 lb ft torque/cu in. Very hot street engine will make 1.4 lb ft torque/cu in.
If your engine is 120 cu in and the head flows 300 cfm, potential hp is about 230hp with peak torque of 190 lb ft if a max effort unrestricted race engine. If you add various rules, adjust downward as necessary.
Re: 3 cyl, 2 valve, scratch build
For sake of simplicity and since dedicated E85 fuel, I think coated aluminum barrels,( air cooled) will do.
Re: 3 cyl, 2 valve, scratch build
Thinking ahead,
I will need a cost-effective, electronic inj. system. If oem. anything tunable, while adding E85 compatible injectors suited for 2L. ?
Thanks, Art.
I will need a cost-effective, electronic inj. system. If oem. anything tunable, while adding E85 compatible injectors suited for 2L. ?
Thanks, Art.
Re: 3 cyl, 2 valve, scratch build
AEM ems4 might be a fair efi ecu for you. I have used a few and they’re not bad for a good price point. Pretty flexible as well.
Re: 3 cyl, 2 valve, scratch build
Using the Ford 4.6L 2V, finger roller cam followers and hyd. lash adjusters. Will this limit rpm., ( pump up), like a push rod application ? Plunger range is ?
Rocker ratio is ? Why is the cam base circle so huge ? Do cam lobes thrust towards lash adjusters ?
Thanks, Art.
Rocker ratio is ? Why is the cam base circle so huge ? Do cam lobes thrust towards lash adjusters ?
Thanks, Art.