Re: New idea for a 273 stroker
[Re: dart4forte]
#1080886
09/23/11 06:25 PM
09/23/11 06:25 PM
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Joined: Feb 2005
Posts: 709 St Louis, MO 63026
convx4
super stock
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super stock
Joined: Feb 2005
Posts: 709
St Louis, MO 63026
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I got to ride in a de-stroked 318. It used the 273 crank. 305 CI like the Real Trans Am racers. I have an old mopar engine book with the build specifics. This motor was in a 69 dart. It would rev way up fast and blast off the line. This would help keep it in the winning position. I ways wanted to build one.
Last edited by convx4; 09/23/11 06:25 PM.
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Re: New idea for a 273 stroker
[Re: convx4]
#1080888
09/23/11 06:48 PM
09/23/11 06:48 PM
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Joined: Jan 2003
Posts: 5,894 Florida
Locomotion
master
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master
Joined: Jan 2003
Posts: 5,894
Florida
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Quote:
I got to ride in a de-stroked 318. It used the 273 crank. 305 CI like the Real Trans Am racers. I have an old mopar engine book with the build specifics. This motor was in a 69 dart. It would rev way up fast and blast off the line. This would help keep it in the winning position. I ways wanted to build one.
273 cranks had the same 3.31" stroke and journal diameters as 318's and 340's. The Trans Am cranks had something like a 2.96" stroke.
One problem with a stroked 273 is that despite the extra cubic inches, the bore size would limit valve size and breathing. I would think that it would make a lot more torque.
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Re: New idea for a 273 stroker
[Re: Locomotion]
#1080889
09/23/11 09:51 PM
09/23/11 09:51 PM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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Quote:
Quote:
I got to ride in a de-stroked 318. It used the 273 crank. 305 CI like the Real Trans Am racers. I have an old mopar engine book with the build specifics. This motor was in a 69 dart. It would rev way up fast and blast off the line. This would help keep it in the winning position. I ways wanted to build one.
273 cranks had the same 3.31" stroke and journal diameters as 318's and 340's. The Trans Am cranks had something like a 2.96" stroke.
One problem with a stroked 273 is that despite the extra cubic inches, the bore size would limit valve size and breathing. I would think that it would make a lot more torque.
torque rules for for fun factor
the whole point of a stroker..no?
I know my uncle had a stock hipo 273 with a .500 lift solid cam that was a beast for a 273 with 4-speed and 3.91sg and it would buzz real high rpms.
I am thinking a 330 or 349 would be real cool on the street as a daily driver and the 349 would not need the bore notching and could use 360 heads
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Re: New idea for a 273 stroker
[Re: Locomotion]
#1080890
09/24/11 06:39 PM
09/24/11 06:39 PM
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Joined: Dec 2003
Posts: 22,695 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,695
Bitopia
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Quote:
One problem with a stroked 273 is that despite the extra cubic inches, the bore size would limit valve size and breathing. I would think that it would make a lot more torque.
Relative to what, a 273, duh, a stroked 318, no, a stroked 340, no, a stroked 360, no. Stroking just makes more or less more torque realtive to hp, not just goobs of torque.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: New idea for a 273 stroker
[Re: jcc]
#1080891
09/24/11 07:04 PM
09/24/11 07:04 PM
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Joined: May 2003
Posts: 3,038 N.W. Florida
Fat_Mike
master
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master
Joined: May 2003
Posts: 3,038
N.W. Florida
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Quote:
Quote:
One problem with a stroked 273 is that despite the extra cubic inches, the bore size would limit valve size and breathing. I would think that it would make a lot more torque.
Relative to what, a 273, duh, a stroked 318, no, a stroked 340, no, a stroked 360, no. Stroking just makes more or less more torque realtive to hp, not just goobs of torque.
What I read into this recipe was a 273 with a few more cubes, and a light rotating assembly. So in a nut shell, it isn't necessarily building up a powerhouse 273, but building a well balanced 273 with a light rotating assembly that will spin up to 7.5, maybe even 8K RPM's. Therefore upping the HP, not just torque. Something that would work out great in an early A-Body. Aside from the "knowns" of what other motor combo's have proven, it would be interesting (IMO) to see the numbers this recipe would make.
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Re: New idea for a 273 stroker
[Re: dogdays]
#1080893
09/25/11 04:31 AM
09/25/11 04:31 AM
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Joined: Dec 2003
Posts: 22,695 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,695
Bitopia
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Different? Take a 340, bore it .060, destroke it back to a final 273, use superlight pistons, use roller cam, wind it to 9800, drop the clutch and hang on, and blow away all the other 273's.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: New idea for a 273 stroker
[Re: jcc]
#1080894
09/25/11 10:56 PM
09/25/11 10:56 PM
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Joined: Jan 2003
Posts: 2,723 541 slobovia
A990
master
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master
Joined: Jan 2003
Posts: 2,723
541 slobovia
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Quote:
Different? Take a 340, bore it .060, destroke it back to a final 273, use superlight pistons, use roller cam, wind it to 9800, drop the clutch and hang on, and blow away all the other 273's.
Well since 273/318s are still in the JYs and the 340s have long ago disappeared, this is a great idea
I have a 65 block and heads in my garage begging to be put to use again.
One thing for Dogdays-
Wonder how a turbocharger would work?
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Re: New idea for a 273 stroker
[Re: 69B3GT]
#1080896
09/26/11 07:58 AM
09/26/11 07:58 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
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Posts: 15,487
Florida
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Quote:
I still have the 273 out of my dart sitting in the garage
If I get another car id like to do something different
a little 273 with the hipo solid lifter cam at .500 lift is pretty nasty in a 66 dart with 4 speed and 3,91sg, my uncles would buzz right up around 6500 rpm and whooped up on some 327 chebby back then.
ask the Rev about his "class of 65" with the record holding 273,IIRC it still holding the record today.
now thats a little bad azz 273 right there
it can be done but you "gotta want it"
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Re: New idea for a 273 stroker
[Re: scratchnfotraction]
#1080897
09/26/11 09:35 AM
09/26/11 09:35 AM
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Joined: Oct 2008
Posts: 1,894 Mira Loma, CA
69B3GT
top fuel
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top fuel
Joined: Oct 2008
Posts: 1,894
Mira Loma, CA
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Quote:
Quote:
I still have the 273 out of my dart sitting in the garage
If I get another car id like to do something different
a little 273 with the hipo solid lifter cam at .500 lift is pretty nasty in a 66 dart with 4 speed and 3,91sg, my uncles would buzz right up around 6500 rpm and whooped up on some 327 chebby back then.
ask the Rev about his "class of 65" with the record holding 273,IIRC it still holding the record today.
now thats a little bad azz 273 right there
it can be done but you "gotta want it"
Maybe one day ill get around to building a wild 273...just gotta get this big block car squared away..one of these days
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Re: New idea for a 273 stroker
[Re: scratchnfotraction]
#1080898
09/26/11 02:47 PM
09/26/11 02:47 PM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
Quote:
I got to ride in a de-stroked 318. It used the 273 crank. 305 CI like the Real Trans Am racers. I have an old mopar engine book with the build specifics. This motor was in a 69 dart. It would rev way up fast and blast off the line. This would help keep it in the winning position. I ways wanted to build one.
273 cranks had the same 3.31" stroke and journal diameters as 318's and 340's. The Trans Am cranks had something like a 2.96" stroke.
One problem with a stroked 273 is that despite the extra cubic inches, the bore size would limit valve size and breathing. I would think that it would make a lot more torque.
torque rules for for fun factor
the whole point of a stroker..no?
I know my uncle had a stock hipo 273 with a .500 lift solid cam that was a beast for a 273 with 4-speed and 3.91sg and it would buzz real high rpms.
I am thinking a 330 or 349 would be real cool on the street as a daily driver and the 349 would not need the bore notching and could use 360 heads
no, the whole point of a stroker is to add displacement...stroke is just a more convienient way to add displacement. one of the mags like hotrod a number of years ago built up 2 383ish cheby motors with identical components, save one was "all bore" with an aftermarket block and stock 350 stroke, the other was all stroke. compression was the same for both. the results? they made essentially the same power, with the "all bore" motor besting the stroker by a few HP/tq due to less valve shrouding. so your exotic, expensive 330CID 273 based stroker has the same HP/tq potential essentially as a .060 over 318....or less than a stock stroke 360....
the other issue with a 4" arm/6.2" rod (1.55 rod ratio) motor is piston velocity....with a stock replacement type cast piston, I wouldn't recommend going past 4000 ft/sec for a mean piston speed, which limits you to ~6000 RPM.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: New idea for a 273 stroker
[Re: Neil]
#1080900
09/26/11 03:42 PM
09/26/11 03:42 PM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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anything larger than the stock 1.78/1.5's require notching of the bore for pbysical clearance
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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