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Re: Higher compression ratio options when starting with 7.5:1? [Re: Brian Hafliger] #2428356
01/03/18 04:09 PM
01/03/18 04:09 PM
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Granbury TX
Prochargedmopar Offline OP
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Originally Posted By ou812
Also, what are your engine specs...like crank, rods, cam, etc....?


30 over 360
Cast crank turned down 10 on mains and to chevy size 2.1 on rod throw.
6.25” chevy I beam eagle rods
Everything was balanced a couple weeks ago, took massive amounts out of counterbalance.
.480/.480 .230/240 115lsa blower cam
1.6 roller rockers should bring lift to .501ish
Main and head studs
.040 mls gasket
main girdle bought still need to machine main caps flat at work on mill

Heads.... And yes, I know the .100 lift #’s aren’t right. lol
And it’s going into this 3400# beast with 3.55 gears.

4D140CBD-0E55-4EE0-84B1-E41C41D57596.pngDBB433DA-EBC1-4CFB-954A-98FFB62619ED.jpeg

"Old" member Registered: Sep 2001
Lost my credentials, I'm Back!! LOL
71 Ply Satellite Procharged
73 Dodge Dart Swinger
73 Ford F-100 390/Sniper efi/back to carb
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08 Dodge 2500 6.7 5" Deleted
02 Mercedes C230K
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Re: Higher compression ratio options when starting with 7.5:1? [Re: Prochargedmopar] #2428357
01/03/18 04:10 PM
01/03/18 04:10 PM
Joined: Jan 2017
Posts: 274
Granbury TX
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This

93B7FA26-3848-4AB8-A764-1E7ED971AC38.jpeg
Last edited by prochargedmopar; 01/03/18 05:43 PM.

"Old" member Registered: Sep 2001
Lost my credentials, I'm Back!! LOL
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73 Ford F-100 390/Sniper efi/back to carb
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08 Dodge 2500 6.7 5" Deleted
02 Mercedes C230K
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Re: Higher compression ratio options when starting with 7.5:1? [Re: Prochargedmopar] #2430337
01/07/18 02:54 AM
01/07/18 02:54 AM
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Granbury TX
Prochargedmopar Offline OP
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Verified combustion chamber volumes today.
Used the cattle syringe, scrounged up plexiglass, and washer fluid trick.


Last edited by prochargedmopar; 01/07/18 02:54 AM.

"Old" member Registered: Sep 2001
Lost my credentials, I'm Back!! LOL
71 Ply Satellite Procharged
73 Dodge Dart Swinger
73 Ford F-100 390/Sniper efi/back to carb
01 Town and Country Limited
08 Dodge 2500 6.7 5" Deleted
02 Mercedes C230K
19 Camry
Re: Higher compression ratio options when starting with 7.5:1? [Re: Prochargedmopar] #2430366
01/07/18 03:57 AM
01/07/18 03:57 AM
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Bend,OR USA
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Knowing exactly(within .2 to .5 CC) how much each chamber holds is way better than hoping you know you what it is up bow grin


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Higher compression ratio options when starting with 7.5:1? [Re: Cab_Burge] #2430384
01/07/18 05:42 AM
01/07/18 05:42 AM
Joined: Jan 2017
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Granbury TX
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Originally Posted By Cab_Burge
Knowing exactly(within .2 to .5 CC) how much each chamber holds is way better than hoping you know you what it is up bow grin


Yeah, even 1-2 CCs is better than my original mental calculation that had me at min. 1.5 compression points off the mark.

Now the decision between $950 pistons and a $1400 stroker kit.

The $450 difference plus cylinder block bore and cleanup
will basically get me a 2nd engine.
8.24 to 1 comp using my current rotating parts and home porting the stock magnum heads.
I could run it with the Holley street dominator single plane on pump gas and a turbo.
Drop it in my dart to use as a megasquirt testbed.

I’m practicing my first efi Shenanigans with this Sniper tbi setup.


Last edited by prochargedmopar; 01/07/18 05:51 AM.

"Old" member Registered: Sep 2001
Lost my credentials, I'm Back!! LOL
71 Ply Satellite Procharged
73 Dodge Dart Swinger
73 Ford F-100 390/Sniper efi/back to carb
01 Town and Country Limited
08 Dodge 2500 6.7 5" Deleted
02 Mercedes C230K
19 Camry
Re: Higher compression ratio options when starting with 7.5:1? [Re: Prochargedmopar] #2430522
01/07/18 03:10 PM
01/07/18 03:10 PM
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SoCal
Brian Hafliger Offline
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Be careful on the pistons you use in a "kit"....very few will be boost friendly!


Brian Hafliger
Re: Higher compression ratio options when starting with 7.5:1? [Re: Brian Hafliger] #2431308
01/08/18 10:25 PM
01/08/18 10:25 PM
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Granbury TX
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Originally Posted By ou812
Be careful on the pistons you use in a "kit"....very few will be boost friendly!


I’ve been offered this kit with 15.5 cc dish pistons which is normally $1440 +ship but a 5% discount.
So it would be $1443 to my door.
Also be around 9.7:1 comp ratio.

Not sure if the Icon forged are up to the task.

Stronger than a cast 9000 series crank OR the main saddles?
How bout with the long arm of the law swinging around inside the stock block?

9B357FC6-903E-4902-952C-3B9B4663F550.png
Last edited by prochargedmopar; 01/08/18 10:30 PM.

"Old" member Registered: Sep 2001
Lost my credentials, I'm Back!! LOL
71 Ply Satellite Procharged
73 Dodge Dart Swinger
73 Ford F-100 390/Sniper efi/back to carb
01 Town and Country Limited
08 Dodge 2500 6.7 5" Deleted
02 Mercedes C230K
19 Camry
Re: Higher compression ratio options when starting with 7.5:1? [Re: Prochargedmopar] #2431420
01/09/18 01:27 AM
01/09/18 01:27 AM
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Granbury TX
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Actually the compression would be 9.1:1
That’s perfect.

TIESON ENGSTRUM
“Thanks for the info. The pistons will have a 1.465" compression height so based off the factory 9.599" deck, pistons will sit .011" in the hole. The compression with factory deck height and 4.000" bore will be right at 9.1:1. If you have the block decked to zero, compression will be right at 9.4:1.”


"Old" member Registered: Sep 2001
Lost my credentials, I'm Back!! LOL
71 Ply Satellite Procharged
73 Dodge Dart Swinger
73 Ford F-100 390/Sniper efi/back to carb
01 Town and Country Limited
08 Dodge 2500 6.7 5" Deleted
02 Mercedes C230K
19 Camry
Re: Higher compression ratio options when starting with 7.5:1? [Re: Prochargedmopar] #2431657
01/09/18 03:43 PM
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Icon pistons are made with 2618 aluminum, which is the more ductile alloy normally used in high stress situations. The other alloy, 4032 or VS-75, is less ductile but still strong. This is what the lower cost forged slugs are usually made of. Federal mogul now calls its alloy "FM4032"

Icon is the forged piston line from Silv-O-Lite, which has been making pistons forever and also makes the Keith Black line of hypereutectic pistons.

R.

Re: Higher compression ratio options when starting with 7.5:1? [Re: dogdays] #2432076
01/10/18 05:19 AM
01/10/18 05:19 AM
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Granbury TX
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Interesting


"Old" member Registered: Sep 2001
Lost my credentials, I'm Back!! LOL
71 Ply Satellite Procharged
73 Dodge Dart Swinger
73 Ford F-100 390/Sniper efi/back to carb
01 Town and Country Limited
08 Dodge 2500 6.7 5" Deleted
02 Mercedes C230K
19 Camry
Re: Higher compression ratio options when starting with 7.5:1? [Re: Prochargedmopar] #2432087
01/10/18 07:59 AM
01/10/18 07:59 AM
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Andrews,In. U.S.of A.
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No problems with the Icon pistons in my 470 @12 lbs.

Last edited by 67_Satellite; 01/10/18 08:00 AM.
Re: Higher compression ratio options when starting with 7.5:1? [Re: 67_Satellite] #2432489
01/10/18 10:35 PM
01/10/18 10:35 PM
Joined: Jan 2017
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Granbury TX
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Originally Posted By 67_Satellite
No problems with the Icon pistons in my 470 @12 lbs.


What heads are you running?


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Lost my credentials, I'm Back!! LOL
71 Ply Satellite Procharged
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02 Mercedes C230K
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Re: Higher compression ratio options when starting with 7.5:1? [Re: Prochargedmopar] #2432682
01/11/18 07:11 AM
01/11/18 07:11 AM
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Home ported r.p.m's

Re: Higher compression ratio options when starting with 7.5:1? [Re: 67_Satellite] #2432867
01/11/18 04:27 PM
01/11/18 04:27 PM
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I think a lot of guys go off of pressure for rating blown motors when volume should be the major concern, a standard 6.71 blower may make 12 Lbs. of boost at 600 HP at 6000 engine RPM and by changing the blower and slowing it down with 8.71 or 10.71 will make 200 HP more at the same or less pressure and RPMs work scope
Same thing on turbo sizes up

Last edited by Cab_Burge; 01/11/18 04:28 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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