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Re: 512 stroker build, need suggestions
[Re: dave73chally]
#1717834
12/30/14 07:46 PM
12/30/14 07:46 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
You still need to look at the dynamic to say for sure
but on my 416 with 9.2 dynamic and iron heads I can
and do run on 87 on the street..I get ZERO knock..
if I want to run on the track I will add some 93...
you can add more with alum heads
Just spoke with my engine builder, he recommends stay near or under 8.5 dynamic for 91 octane. That means I'd be going with 80cc stealth heads, 440 source 512 stroker with -27cc pistons. Gives me a compression of 10:1 and dynamic of 8.4:1. What do you guys think?
He is your builder.. do what he says... I assume
your gonna have it dyoed so he should be backing it
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Re: 512 stroker build, need suggestions
[Re: MR_P_BODY]
#1717835
12/30/14 07:59 PM
12/30/14 07:59 PM
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Joined: Jan 2003
Posts: 74,988
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,988
U.S.S.A.
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Quote:
He is your builder.. do what he says...
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Re: 512 stroker build, need suggestions
[Re: jose jones]
#1717837
12/30/14 10:33 PM
12/30/14 10:33 PM
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Joined: Jan 2003
Posts: 12,046
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,046
Benton, IL.
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I used Ohio Crank for my 440 based 499. Comp ratios were a problem for me, too. Talked to Ohio Crank about it and they calculated the amount the pistons would need to be milled and milled them for under $100.
Master, again and still
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Re: 512 stroker build, need suggestions
[Re: dave73chally]
#1717839
12/31/14 01:33 PM
12/31/14 01:33 PM
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Joined: Jan 2003
Posts: 12,046
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,046
Benton, IL.
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It is common for people to choose too much carb and too much cam, so people choosing too much compression for the application would not be surprising. If you're concerned about detonation on your pump gas, then go with the lower C/R and build the quench. Your already using aluminum heads which will help.
Can someone calculate the difference in power between the 2 C/Rs? I'll bet it's not much.
And why isn't there more discussion about quench in this? Isn't it an important component in this combo?
Last edited by DaveRS23; 12/31/14 01:45 PM.
Master, again and still
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Re: 512 stroker build, need suggestions
[Re: JohnRR]
#1717841
12/31/14 01:56 PM
12/31/14 01:56 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
If I use re -17cc pistons it gives me a compression ratio of 10.6 and dynamic of 8.9, doesn't this sound too high for 91 octane? Spoke with 440 source and they said majority if people go with the 17cc kit. I'm trying to find some definite information on running 91 with this setup before I dish out the cash. The -27 gives more conservative numbers, CR of 10:1 and dynamic of 8.4:1 but yet the 440 source tech said not many people order this, why? I understand leaving power on the table but I'd rather have it somewhat mild, good street manners and super reliable.
80cc stealth heads
Lunati 60312 hydraulic roller
440 source 512 kit
Since you big hang up is running on lower octane fuel just use the piston that gives the lower compression ratio ..
if he is all that concerned about compression
use the low compression piston... I said what I run
and that makes 590hp out of my 416 525 tq... if I
want to change the compression I can change head gaskets
but right now my quench is .040
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Re: 512 stroker build, need suggestions
[Re: dave73chally]
#1717844
12/31/14 02:08 PM
12/31/14 02:08 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Yea I agree, lower compression kit is better for my needs. All things being equal other than piston dome cc, how much of a power decrease will I see between 10.5:1 CR and 10:1 CR?
Even if you lost 20 hp the cost saving driving it on
the street would be far better... thats why I drive on
the street on 87
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Re: 512 stroker build, need suggestions
[Re: dave73chally]
#1717845
12/31/14 02:23 PM
12/31/14 02:23 PM
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Joined: Jan 2003
Posts: 12,046
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,046
Benton, IL.
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We all remember the .100 in the hole, low compression 440s of the late 70s. Some of them knocked on premium. Just plane bad combos.
Point being, that C/R is not the end-all, be-all when it comes to detonation. It is the whole package.
Master, again and still
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Re: 512 stroker build, need suggestions
[Re: dave73chally]
#1717847
12/31/14 02:51 PM
12/31/14 02:51 PM
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Joined: Jan 2003
Posts: 12,046
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,046
Benton, IL.
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I've used that Holley intake on my 499. Worked good. With a little larger cam, I ran both the 850 and 950 carbs. I only changed the Holley intake out when I went with the Dominator. I actually converted the Holley to the Dominator for a while as a test. It worked okay, the car picked up a bit.
That is a relatively small cam for that engine. With 512" and mild heads, it certainly won't pull to 6,200. That range must be for a smaller inch engine.
Master, again and still
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Re: 512 stroker build, need suggestions
[Re: dave73chally]
#1717848
12/31/14 03:24 PM
12/31/14 03:24 PM
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Joined: Dec 2013
Posts: 4,669
Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,669
Wichita
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Quote:
Awesome, thanks guys. Here's what the basics of my build is going to look like, what do you think?
-512 stroker (440 @ .055 over)
-27cc dish, 4.250 stroke, 7.100 rod
- Holley Street dominator Intake
- 850-950 carb
- 440 Source Stealth heads (80cc)
- Lunati 60312
.535/.550 lift, .231/.239@.050,.283/.290 advertised, 110 lobe sep, Rpm 2200-6200
- 1.5 comp pro magnum rockers
I'm planning on doing a very similar build this spring and gathering parts right now.
The big difference is I'm using the Indy EZ-1 heads.
You cam does look a little small for that combo.. 
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Re: 512 stroker build, need suggestions
[Re: GY3]
#1717849
12/31/14 04:30 PM
12/31/14 04:30 PM
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Joined: Sep 2014
Posts: 26
North Jersey
dave73chally
OP
member
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OP
member
Joined: Sep 2014
Posts: 26
North Jersey
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I was between the lunati 60312 and 60313. My thinking was I'd rather undercam slightly than overcam. Want the low end power for the street as I doubt I'll be revving it that high. Here's the 60313, I thought it looked too big?  Lunati 60313 Duration: .294/.302 Duration @ .50: .243/.251 Lift: .560/.565 Lobe sep: 110 Rpm: 2600-6600
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Re: 512 stroker build, need suggestions
[Re: dave73chally]
#1717850
12/31/14 05:19 PM
12/31/14 05:19 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I was between the lunati 60312 and 60313. My thinking was I'd rather undercam slightly than overcam. Want the low end power for the street as I doubt I'll be revving it that high. Here's the 60313, I thought it looked too big?
Lunati 60313
Duration: .294/.302
Duration @ .50: .243/.251
Lift: .560/.565
Lobe sep: 110
Rpm: 2600-6600
Those rpm specs are for a 440ci engine.. a stroker
will eat up duration
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Re: 512 stroker build, need suggestions
[Re: dave73chally]
#1717852
12/31/14 05:52 PM
12/31/14 05:52 PM
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Joined: Jan 2003
Posts: 74,988
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,988
U.S.S.A.
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Quote:
Awesome, thanks guys. Here's what the basics of my build is going to look like, what do you think?
-512 stroker (440 @ .055 over)
-27cc dish, 4.250 stroke, 7.100 rod
- Holley Street dominator Intake
- 850-950 carb
- 440 Source Stealth heads (80cc)
- Lunati 60312
.535/.550 lift, .231/.239@.050,.283/.290 advertised, 110 lobe sep, Rpm 2200-6200
- 1.5 comp pro magnum rockers
I think you should stop second guessing your engine builder.
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Re: 512 stroker build, need suggestions
[Re: MR_P_BODY]
#1717853
12/31/14 10:55 PM
12/31/14 10:55 PM
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Joined: Nov 2014
Posts: 166
Massachusetts
Row_your_own
member
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member
Joined: Nov 2014
Posts: 166
Massachusetts
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Quote:
Quote:
I was between the lunati 60312 and 60313. My thinking was I'd rather undercam slightly than overcam. Want the low end power for the street as I doubt I'll be revving it that high. Here's the 60313, I thought it looked too big?
Lunati 60313
Duration: .294/.302
Duration @ .50: .243/.251
Lift: .560/.565
Lobe sep: 110
Rpm: 2600-6600
Those rpm specs are for a 440ci engine.. a stroker
will eat up duration
combo looks good but I'd go with the 60313
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OR zero............. 