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#2428356 - 01/03/18 01:09 PM Re: Higher compression ratio options when starting with 7.5:1? [Re: ou812]
prochargedmopar Offline
enthusiast

Registered: 01/21/17
Posts: 228
Loc: Granbury TX
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.


Attachments
4D140CBD-0E55-4EE0-84B1-E41C41D57596.png

DBB433DA-EBC1-4CFB-954A-98FFB62619ED.jpeg


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#2428357 - 01/03/18 01:10 PM Re: Higher compression ratio options when starting with 7.5:1? [Re: prochargedmopar]
prochargedmopar Offline
enthusiast

Registered: 01/21/17
Posts: 228
Loc: Granbury TX
This


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93B7FA26-3848-4AB8-A764-1E7ED971AC38.jpeg




Edited by prochargedmopar (01/03/18 02:43 PM)
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#2430337 - 01/06/18 11:54 PM Re: Higher compression ratio options when starting with 7.5:1? [Re: prochargedmopar]
prochargedmopar Offline
enthusiast

Registered: 01/21/17
Posts: 228
Loc: Granbury TX
Verified combustion chamber volumes today.
Used the cattle syringe, scrounged up plexiglass, and washer fluid trick.



Edited by prochargedmopar (01/06/18 11:54 PM)
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#2430366 - 01/07/18 12:57 AM Re: Higher compression ratio options when starting with 7.5:1? [Re: prochargedmopar]
Cab_Burge Offline
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Registered: 08/23/03
Posts: 29970
Loc: Bend,OR USA
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
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#2430384 - 01/07/18 02:42 AM Re: Higher compression ratio options when starting with 7.5:1? [Re: Cab_Burge]
prochargedmopar Offline
enthusiast

Registered: 01/21/17
Posts: 228
Loc: Granbury TX
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.



Edited by prochargedmopar (01/07/18 02:51 AM)
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#2430522 - 01/07/18 12:10 PM Re: Higher compression ratio options when starting with 7.5:1? [Re: prochargedmopar]
ou812 Offline


Registered: 01/31/03
Posts: 5334
Loc: SoCal
Be careful on the pistons you use in a "kit"....very few will be boost friendly!
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#2431308 - 01/08/18 07:25 PM Re: Higher compression ratio options when starting with 7.5:1? [Re: ou812]
prochargedmopar Offline
enthusiast

Registered: 01/21/17
Posts: 228
Loc: Granbury TX
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?


Attachments
9B357FC6-903E-4902-952C-3B9B4663F550.png




Edited by prochargedmopar (01/08/18 07:30 PM)
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#2431420 - 01/08/18 10:27 PM Re: Higher compression ratio options when starting with 7.5:1? [Re: prochargedmopar]
prochargedmopar Offline
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Registered: 01/21/17
Posts: 228
Loc: Granbury TX
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.”
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#2431657 - 01/09/18 12:43 PM Re: Higher compression ratio options when starting with 7.5:1? [Re: prochargedmopar]
dogdays Offline
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Registered: 01/20/03
Posts: 15922
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.

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#2432076 - 01/10/18 02:19 AM Re: Higher compression ratio options when starting with 7.5:1? [Re: dogdays]
prochargedmopar Offline
enthusiast

Registered: 01/21/17
Posts: 228
Loc: Granbury TX
Interesting
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90 Jaguar XJ6
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#2432087 - 01/10/18 04:59 AM Re: Higher compression ratio options when starting with 7.5:1? [Re: prochargedmopar]
67_Satellite Offline
super stock

Registered: 01/20/03
Posts: 887
Loc: Andrews,In. U.S.of A.
No problems with the Icon pistons in my 470 @12 lbs.


Edited by 67_Satellite (01/10/18 05:00 AM)

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#2432489 - 01/10/18 07:35 PM Re: Higher compression ratio options when starting with 7.5:1? [Re: 67_Satellite]
prochargedmopar Offline
enthusiast

Registered: 01/21/17
Posts: 228
Loc: Granbury TX
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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"Old" member Registered: Sep 2001
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#2432682 - 01/11/18 04:11 AM Re: Higher compression ratio options when starting with 7.5:1? [Re: prochargedmopar]
67_Satellite Offline
super stock

Registered: 01/20/03
Posts: 887
Loc: Andrews,In. U.S.of A.
Home ported r.p.m's

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#2432867 - 01/11/18 01:27 PM Re: Higher compression ratio options when starting with 7.5:1? [Re: 67_Satellite]
Cab_Burge Offline
Too Many Posts

Registered: 08/23/03
Posts: 29970
Loc: Bend,OR USA
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


Edited by Cab_Burge (01/11/18 01:28 PM)
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