turbos and quench - open chamber heads

[Beagle]

School 1 says leave quench at .035 - .040 for a steel rod low boost (under 15 psi for this) mill.

School 2 says NO quench (+.120 or more piston to head clearance) at all and soften everything.

let's say you had some junk laying around, following school number 2, what do you think?

Cleveland 2v Open Chamber heads, 75cc , roughly 8.4:1 with Flat tops with intake valve clearance notch, 1-2 cc. They'd be in the hole about .070. Stock "HO" ford Cam (115* LSA) with 1.7 rockers (.476 lift)

3.75 stroke forged crank, 351 Windsor F4TE block (377 cubic inches), forged I beams, forged pistons

Tunnel ram, 4bbl EFI Throttle body or a hat and big oval 1000cfm size throttle body

HX55 Holset turbo (.75kg/s, roughly 800 hp worth of airflow capacity)

something large intercooler

I wonder if that is low enough compression for the crappy heads or if it would need to be fed water and meth?

[SuperBuickGuy]

how good are your head gaskets?

[milner351]

clevor with a turbo? RIGHTEOUS.... those aren't crappy heads - they'd love the turbo. Cam timing would be critical to avoid hyper sensitivity to detonation?

[Beagle]

how good are your head gaskets?

o-ring receiver grooved Felpros

[Beagle]

clevor with a turbo? RIGHTEOUS.... those aren't crappy heads - they'd love the turbo. Cam timing would be critical to avoid hyper sensitivity to detonation?

HO cam , but I wouldn't put a custom grind out of the question. Turbos are funky... but lots of guys ran HO cams with good success. The Dynamic Compression Ratio looks kinda low, like 6.73

[milner351]

sounds like you've done your research - is it running yet?

[Barry Donovan]

how good are your head gaskets?

just need the metal gasket ring.

that compression seems way too low written. Flats and 75cc?

is that not 9 something?

for boost going above deck needs grooved ring, or headgasket useless.

even my old zube is zero deck and boosted history...but its got a grooved ring for the gasket to sit in the block.

I even learned a trick with steel coat hanger and a dremel...old stuff.

[BigAL]

I'm just running the Felpro Blue's.... Was told they would work perfectly fine.

[Beagle]

it's .119 in the hole on paper Barry, that's where the compression went.

[BBR]

Echo-eight-fiver

echo-eight-fiver

do you read me?

Come in echo-eight-fiver

[38P]

Count me in School 1.

Open chamber Cleveos have the rep of being prone to knock, even before you start compressing the atmos. Alcohol (the racin' kind, not the drinkin' kind)will be your friend. Without quench and with a short cam, I suspect you'll need it at less than the 12 psi benchmark on pump swill (See Mark Warner, Street Turbocharging)

Duration could increase substantially over the HO if you're running a loose enough torque converter/gears. Comp spec'd mine at more than 240 (@ .050).

I'd run the cheapest throttle body that would flow what I needed . . . not a lot o' power there, IMO. (On a real low-buck set-up, why not score a few dirt-cheap JY TBs, rig an old-school progressive linkage (e.g. early 60s Stromberg 97s) and make a simple mounting plate, with induction tubes similar to how they used to run VS-57 Paxtons on a tri-power)

On a bigger buck build, I'd think about a torque monster like a Trick Flow EFI "Clevor" http://www.summitracing.com/search/p...k-powdercoated (Chrysler proved the value of ram-tuning over fifty years ago . . . a tunnel ram might not have enough runner length unless you're planning to peak over 6,000 r.p.m. A 5k peak optimizes at about a 16-17 inch runner/port length (using the Chrysler or Magnante formulae) . . . hard to do with a cast tunnel ram)

Unless you're going to boost the crap out of it, you've got more bottom end than cylinder head. And if that's the case (> ~12 psi with quench & charge cooling and probably 8-10 psi cooled but without quench), octane and/or ETOH/H20 are likely a necessary part of the plan.

Have fun.

[Beagle]

Echo-eight-fiver

echo-eight-fiver

do you read me?

Come in echo-eight-fiver

that's why it's in General, not tech or projects, and says "let's say you had some junk laying around, following school number 2, what do you think?" I have the junk, but will it ever get put together? : P

Avalanche of bullshit? I had to look that up... lmfao! Nice.

[BBR]

I'd bolt it together, damn the math, feed it a steady diet of E-85 and have fun until it decides to die.... IF it decides to die.

That being said, I need a 6-71 for the pickup.... no make that an effin' 8-71.

[Beagle]

Open chamber Cleveos have the rep of being prone to knock, even before you start compressing the atmos....

at 8.4:1 ? I'd try it.

Duration could increase substantially over the HO if you're running a loose enough torque converter/gears. Comp spec'd mine at more than 240 (@ .050).

no money for that

I'd run the cheapest throttle body that would flow what I needed . . . not a lot o' power there, IMO. (On a real low-buck set-up, why not score a few dirt-cheap JY TBs, rig an old-school progressive linkage (e.g. early 60s Stromberg 97s) and make a simple mounting plate, with induction tubes similar to how they used to run VS-57 Paxtons on a tri-power)

Now THAT is bench racing! Made me think... 2 x 460 EFI TB's. Great idea. It'd look retarded too. I think a box on top of the 2x4 setup already there would be easier, front facing TB.


Unless you're going to boost the crap out of it, you've got more bottom end than cylinder head. And if that's the case (> ~12 psi with quench & charge cooling and probably 8-10 psi cooled but without quench), octane and/or ETOH/H20 are likely a necessary part of the plan.

METHANOL + Water with a hobbs switch

Have fun.

Already am, thanks for joining in.

[Beagle]

I'd bolt it together, damn the math, feed it a steady diet of E-85 and have fun until it decides to die.... IF it decides to die.

That being said, I need a 6-71 for the pickup.... no make that an effin' 8-71.

I missed the E85. Getting dense. Urban dictionary lists 85 as "absolute avalance of bullshit" which this pretty much is. I'm tripping over some of this shit, it's gotta go. I've been trying to figure out what to do with the 95 Lightning too - it's days as a pickup truck are pretty much over.

It'd be fun to do for the hell of it. Need little black car to move on it's own which is getting closer finally and then maybe give this some thought.