Engine Masters Episode 77 - TorqStormed Slant - Spoilers?

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64DartGTinAZ said:
Anybody seen this and can report what the dyno said they made HP and Torque?

:)
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still less then a junkyard 360?



rotfl-gif-10.gif
 
--------------------------------torque--------------horsepower

naturally aspirated------------251@4200--------215@4900rpm
supercharged 7.5 psi---------315@4500--------308.5@5400
supercharged 10.5psi--------341.3@4800------328.4@5400


motor was hurt with 10.5 psi. blown head gasket

made more hearsepurrs than a factory 383 dart
 
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Did they make any changes to the engine other then the blower, from NA?
If not, no wonder they hurt the motor at 10.5 boost. I can't see the video, but if they were making over 200 hp NA they probably had too much compression for 10 psi
 
Charrlie_S said:
Did they make any changes to the engine other then the blower, from NA?
If not, no wonder they hurt the motor at 10.5 boost. I can't see the video, but if they were making over 200 hp NA they probably had too much compression for 10 psi
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You know how some of them engine contests are too.....with happy dynos and all.....
 
RustyRatRod said:
You know how some of them engine contests are too.....with happy dynos and all.....
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Some yes, but not this one. Steve Brule is a stand up guy and Westec is a stand up operation. They are local to me and I have had engines on their dyno. They do not “fudge” numbers here. The only deviation from a stock bottom end on that engine was ring gap. Stock crank, rods, pistons, from like 1984 or something. Dulcich ported the head, shaved it and decked the block to get compression up. And they ran it on 116 the weak link was the head gasket as slants have dinky little head bolts and only 4 per cylinder.
 
TT5.9mag said:
Some yes, but not this one. Steve Brule is a stand up guy and Westec is a stand up operation. They are local to me and I have had engines on their dyno. They do not “fudge” numbers here. The only deviation from a stock bottom end on that engine was ring gap. Stock crank, rods, pistons, from like 1984 or something. Dulcich ported the head, shaved it and decked the block to get compression up. And they ran it on 116 the weak link was the head gasket as slants have dinky little head bolts and only 4 per cylinder.
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I wonder what gasket they used? I'm sure Cometic could have whipped them up one that would hold up.
 
Dulcich said he used a stock replacement type gasket. Did not say which one.
 
TT5.9mag said:
Dulcich said he used a stock replacement type gasket. Did not say which one.
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Heck, a steel shim gasket mightta held better than that. lol I'm sure there was something out there that couldda held. It's not like 10.5 PSI is a lot.
 
I thought "upped compression" was not a good thing on a forced induction engine.
 
It is possible to run 10 psi with 10.5 cr, but I don't think it could be done with that head gasket, and stock head bolts. The timing and A/F ratio would need to be spot on. In general it would be better to run 10.x to one and 7-8 lbs boost, then to run 8.0 to 1 cr and 10 lbs boost, in a street type motor. That is with a carb, and regular ign. Fuel inj, and electronic timing control, is a whole nother ball game.
 
I think Dulcich said when he was putting the engine together, he wasn't considering adding boost. So I guess that's why he used a stock head gasket. He also used a cast crank and pistons, which Steven Brule' and David Freiburger though let go. Dulcich said head gasket right away, and was right.

I don't know if they are still running the special, but I got a great price on Motor Trend channel, $24 for one year. It's worth it, with all the back episodes of a lot of shows I like. I'm not sure I'll renew at full price, but I'm getting my two bucks a month worth now.
 
YY1 said:
I thought "upped compression" was not a good thing on a forced induction engine.
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It's not if you want to actually SPIN and USE the blower.
 
S'cuder said:
I think Dulcich said when he was putting the engine together, he wasn't considering adding boost. So I guess that's why he used a stock head gasket. He also used a cast crank and pistons, which Steven Brule' and David Freiburger though let go. Dulcich said head gasket right away, and was right.

I don't know if they are still running the special, but I got a great price on Motor Trend channel, $24 for one year. It's worth it, with all the back episodes of a lot of shows I like. I'm not sure I'll renew at full price, but I'm getting my two bucks a month worth now.
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I can see that.....got it together and maybe the blower opportunity fell in his lap. He probably said "hell yeah" and crossed his fingers. lol
 
Charrlie_S said:
Did they make any changes to the engine other then the blower, from NA?
If not, no wonder they hurt the motor at 10.5 boost. I can't see the video, but if they were making over 200 hp NA they probably had too much compression for 10 psi
Click to expand...

They don't hold up for very long under High cylinder pressures. 12 1/2 to 1 they start popping. Cometic helps.
 
Watched this morning...and then showed my Daughter who has a slant 6 in her 63 Valiant 270 Wagon.....

Stock engine with 1 barrel....slow....slower...and slowest....
 
2 of our 3 mopars are slant 6 cars. We have crunched the numbers and talked about a boosted 6 vs. a mild v8 many times. The v8 wins in most scenarios and has instant torque, but the boosted 6 is fun and interesting. I would only add forced induction with efi. It was cool that they actually did the dyno test, even if it was made fun of a bit. The numbers were good for the n/a slant and better for the blower. I have never been able to kill a slant 6. I tried in high school on my 69 dodge truck, eventually swapped a big block in and sold the 6. The big block eventually developed a rod knock...
Nates68
 
nates68 said:
2 of our 3 mopars are slant 6 cars. We have crunched the numbers and talked about a boosted 6 vs. a mild v8 many times. The v8 wins in most scenarios and has instant torque, but the boosted 6 is fun and interesting. I would only add forced induction with efi. It was cool that they actually did the dyno test, even if it was made fun of a bit. The numbers were good for the n/a slant and better for the blower. I have never been able to kill a slant 6. I tried in high school on my 69 dodge truck, eventually swapped a big block in and sold the 6. The big block eventually developed a rod knock...
Nates68
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I loved the project. I think it has real potential. I would have done it differently in that I would have gone with a custom forged dished piston and gotten compression at 7.5. Then run the 10-12 pounds of boost. I think what they did was begin a naturally aspirated project and somehow the blower got thrown at them and they said "what the heck?". I think there's plenty of potential there.
 
have a '74 225 in machine shop jail now, been there 5 months and counting. Still waiting on word as to what o/ and u/s pistons rings and bearings I am gonna need.
this engine is headed for my 85 D150. and I have been kicking the turbo idea around for a while..... debating on that, or a strong N/A build... I have a set of NOS rods, am ready to send my cam to Oregon, have 2 grinds in mind depending if I do the turbo thing or not.... I'm only looking at running 6-8 lb of boost nothing crazy if I go that way. The 360 that would have been in such a truck, was quite the pooch by the mid 80s. I'm basically hoping I can get at least the power of a stock '80s 360 out of my slant..... which is basically only what a slant was rated at, before '72..... truck is destined to be a 3 season driver.

staying with a slant because I figure the $$$ I save by not needing to trade out the existing 727 (YES it is a 727 not a 904/998.... I was surprised too!)Also I dont need to buy different mounts, or a truck oil pan/pickup, , or a V8 radiator, means that I can put more into trying to get the most power I can out of the slant....
not gonna be a race truck but if I want to pull my popup 2 states away with a bed full of firewood, Coleman camping gear, maybe a couple of pedal bikes and such, and not have to worry about it,,, I can.... and just because 90% of anyone else with this truck definitely would dump the slant for a V8...... I want different.
 
I gotta admit..when I built my EFI intake for my slant, I took the stock cam spec intake duration to measure my tuned runners, then I got a Stage 2 crane cam with more duration, then I got a turbo. So mine is somewhat mismatched. But the 273 Im building is turbo from the ground up...low comp stock 2v pistons, MPFI with short runners, Isky turbo grind cam, flipped Magnum manifolds, HX35 Turbo, forged crank. EZ stuff on a 273!
 
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