As it turns out, I'm pretty close to 11:1
A slight error was made with the stroke of my crank as it turns out.
Premium fuel only.
Works fine. The locker makes a racket though.
CJ
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| anyone run 10:1 on the street carburated ? https://www.slantsix.org/forum/viewtopic.php?t=39648 |
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| Author: | USAJon [ Tue Mar 30, 2010 1:54 pm ] |
| Post subject: | anyone run 10:1 on the street carburated ? |
so Im talking to RR steve and he says he runs 10:1 on the street in his 440..anyone done this in a slant six. |
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| Author: | Joshie225 [ Tue Mar 30, 2010 2:19 pm ] |
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It's easy to do as long as you close the intake valve late enough to drop the dynamic compression ratio. Smaller combustion chambers will generally support a higher CR so it should be easier to run 10:1 in a slant than a 440. If the 440 has quench combustion chambers it will be able to support a higher dynamic compression ratio. |
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| Author: | Exner Geek [ Tue Mar 30, 2010 3:18 pm ] |
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10:1 on the street is not a problem, I run a 236 degree cam at .050 with the intake centerline at 102. I usually use the best grade of gas 91-93 octane but I am not sure you would have to, knocking has never been a problem but I also run a standard transmission which tends to not lug the engine as much. |
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| Author: | USAJon [ Tue Mar 30, 2010 3:59 pm ] |
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Quote: 10:1 on the street is not a problem, I run a 236 degree cam at .050 with the intake centerline at 102. I usually use the best grade of gas 91-93 octane but I am not sure you would have to, knocking has never been a problem but I also run a standard transmission which tends to not lug the engine as much.
how's that puppy run? any pics? car/engine? thanks! |
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| Author: | ceej [ Tue Mar 30, 2010 4:48 pm ] |
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As it turns out, I'm pretty close to 11:1 A slight error was made with the stroke of my crank as it turns out. Premium fuel only. Works fine. The locker makes a racket though. CJ |
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| Author: | Dart270 [ Wed Mar 31, 2010 6:36 am ] |
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I have run several motors between 10:1 and 11.1:1 on premium gas. Big cam and careful ignition timing is the key. Lou |
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| Author: | USAJon [ Wed Mar 31, 2010 7:21 am ] |
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Quote: I have run several motors between 10:1 and 11.1:1 on premium gas. Big cam and careful ignition timing is the key.
talking to RR steve he did say you can run hi comp but you ghave to retard the timing and that is the wrong way 2go...you should run as hi comp as your fuel does not ping..he did say aluminum heads cool faster alowing another .5 in comp.but there are no aluminum heads on slants. Lou so...trying 2figure on a seperte motor build for the treet. looking@ all options including funding which seems the BIG factor...ha! |
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| Author: | ceej [ Wed Mar 31, 2010 7:45 am ] |
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For a daily driven car your going to be better off with lower compression. I've got 28.5° all in. That's not going to get me into the mpg club. It goes like a scalded cat at the strip though.  CJ |
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| Author: | USAJon [ Wed Mar 31, 2010 9:15 am ] |
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Quote: For a daily driven car your going to be better off with lower compression.
so what times/speed there..type o car et al..
I've got 28.5° all in. That's not going to get me into the mpg club. It goes like a scalded cat at the strip though. CJ |
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| Author: | Dart270 [ Wed Mar 31, 2010 11:07 am ] |
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I have pulled down 23-26 MPG hwy in my '64 Dart running 10.6:1 and mid 14 sec 1/4 miles. Cast piston 0.060" over w/225 rods and. Good enough? All about the combo and tuning... Lou |
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| Author: | USAJon [ Wed Mar 31, 2010 12:31 pm ] |
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Quote: I have pulled down 23-26 MPG hwy in my '64 Dart running 10.6:1 and mid 14 sec 1/4 miles. Cast piston 0.060" over w/225 rods and. Good enough? All about the combo and tuning...
93 octane?
Lou |
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| Author: | Dart270 [ Wed Mar 31, 2010 12:41 pm ] |
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91-93 octane, yes. If it were *just* a street/strip car, would likely run 13s, but set up more for handling/roadcourse. Buildup specs: http://slantsix.org/forum/viewtopic.php ... ht=64+dart Some pics: http://www.flickr.com/photos/16910097@N ... 013976355/ Lou |
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| Author: | 70valiant [ Wed Mar 31, 2010 1:27 pm ] |
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The engine I had in my Valiant and Swinger had 9.8:1. I got 21mpg at 70 mph highway with 3.23's and a LU904, I ran 89 octane. with 93 Octane I could run more advance. it had 39cc chambers and with a basicly stock cam I got a best of 16.35@83 in the 1/4 running 3.91 gears. It was a daily driver. |
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| Author: | USAJon [ Wed Mar 31, 2010 1:53 pm ] |
| Post subject: | |
Quote: 91-93 octane, yes. If it were *just* a street/strip car, would likely run 13s, but set up more for handling/roadcourse.
how did you like those Clifford Street Rod headers .Buildup specs: http://slantsix.org/forum/viewtopic.php ... ht=64+dart Some pics: http://www.flickr.com/photos/16910097@N ... 013976355/ Lou what was your RPM's on the 1/4 mile track gears.. |
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| Author: | ceej [ Wed Mar 31, 2010 2:04 pm ] |
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1974 4dr Valiant "Hooptie." Class III hitch, usually with the stinger still in it. ~20 MPG. Best of 15.66 sec quarter. ~3620# all buckled in. 3.50 gears and a locker behind the A904. We'll see how it does at Woodburn now that I've taken some weight off and solved some serious head flow issues.  CJ |
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