Previous Thread
Next Thread
Print Thread
500 stroker question #969024
04/07/11 10:56 PM
04/07/11 10:56 PM
Joined: Jan 2003
Posts: 738
Columbus Ohio
M
mopfried Offline OP
super stock
mopfried  Offline OP
super stock
M

Joined: Jan 2003
Posts: 738
Columbus Ohio
I am thinking of a 500 stroker for my 69 dart based on a 440 +.030 overbore and an Indy 500 stroker kit. The compression ratio worries me. what kind of static compression can I run on pump gas... What cam would be streetable on a 500" motor? I am not looking for max hp but something impressive.

Re: 500 stroker question [Re: mopfried] #969025
04/07/11 11:22 PM
04/07/11 11:22 PM
Joined: Dec 2004
Posts: 10,551
Rittman Ohio
fourgearsavoy Offline
I Live Here
fourgearsavoy  Offline
I Live Here

Joined: Dec 2004
Posts: 10,551
Rittman Ohio
It all depends on your heads and piston type You should read AndyF's book on HP bigblocks there is some good info in there about piston and chamber design
Gus


64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
Re: 500 stroker question [Re: fourgearsavoy] #969026
04/08/11 12:00 AM
04/08/11 12:00 AM
Joined: Aug 2003
Posts: 1,062
Amherst,NY
challengermike Offline
super stock
challengermike  Offline
super stock

Joined: Aug 2003
Posts: 1,062
Amherst,NY
mines 9.8 to 1 with 906 heads and no problems.That with KB pistons and a cat stroker crank and rods.

Re: 500 stroker question [Re: mopfried] #969027
04/08/11 03:19 AM
04/08/11 03:19 AM
Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar Offline
master
451Mopar  Offline
master

Joined: May 2008
Posts: 5,399
Aurora, Colorado
With 500 cubes you don't need alot of compression for the street, but the engine will want alot of airflow and cam.
I have gathered up almost all the parts I need to build my 440 into a 505" stroker.
I'm using the 440 source 4.25" stroker kit with 7.1" rods and 17cc dished pistons (0.030" over), with the older 84cc Stealth heads. That should give me 9.93:1 compression. I haven't ordered a cam yet, but I'm leaning towards the Comp hydraulic Roller cam XR286HR10. The cam is 236/242 duration@0.050, 0.544"/0.541" valve lift with 1.5:1 rocker arms, 110 lsa, 106 cl. I'm using 1.7:1 rockers, so the valve lift should be 0.617"/0.613".

Re: 500 stroker question [Re: mopfried] #969028
04/09/11 12:09 PM
04/09/11 12:09 PM
Joined: Feb 2009
Posts: 54
ca,us
1
1hirschdalemopar Offline
member
1hirschdalemopar  Offline
member
1

Joined: Feb 2009
Posts: 54
ca,us
I am in the process of gathering parts for my stroker 500 right now (same set up as 451mopar)and andy's book is a must read.I to have not chose a cam yet , (hard to decied).Anyway I am shooting for 10.3 to 1 with a large enough cam to bring the dynamic compression down below 8.5 to 1 so it will be pump gas friendly.
After reading andy's book there are a lot of other factors involved than just static compression ratio , (quench , aluminum , iron heads , combustion chamber design , pistons , etc.)
But I think dynamic compression ratio is more important than the static ratio when it comes to running pump gas.


superbee
Re: 500 stroker question [Re: 1hirschdalemopar] #969029
04/09/11 01:09 PM
04/09/11 01:09 PM
Joined: Jan 2007
Posts: 7,664
IN
A
ahy Offline
master
ahy  Offline
master
A

Joined: Jan 2007
Posts: 7,664
IN
As a general guide, 9.5 CR for iron heads and 10.3-10.5 for aluminum on pump gas. If you build the engine for quench - meaning clearance between the flat part of the piston and flat part of the head at TDC is .040" - detonation resistance will improve and you can run higher compression and/or more timing and/or lower octane fuel.

At 500" you will almost certainly need a dish piston to get CR where it needs to be for pump gas. A "D dish" piston keeps has a flat area to create quench with the head.

A bigger cam can take more compression so cam choice matters. After you have choosen a cam, you may get more specific advice. Gearing, convertor and application also influence CR choice. Sustained hard running builds up heat and can cuase detonation so CR has to be a bit lower.

I choose 10.2 with my 496/Ed head quench engine to keep a little detonation margin for sustained hard running in a road race application.

Re: 500 stroker question [Re: 451Mopar] #969030
04/09/11 02:39 PM
04/09/11 02:39 PM
Joined: Jan 2003
Posts: 738
Columbus Ohio
M
mopfried Offline OP
super stock
mopfried  Offline OP
super stock
M

Joined: Jan 2003
Posts: 738
Columbus Ohio
The Indy kit I am considering states 12.5 with 75 CC head. I can get sidhed pistons.. I am considering buying this kit used at a great price so new pistons may not be out of the question. The cam that is witht he kit is the largest befor a roller cam.. Dont know the exact specs yet. I want this pump gas and steetable.I have drove over cammed motors on the street and its no fun.

Re: 500 stroker question [Re: mopfried] #969031
04/09/11 03:56 PM
04/09/11 03:56 PM
Joined: Jan 2003
Posts: 74,942
U.S.S.A.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 74,942
U.S.S.A.
Quote:

The Indy kit I am considering states 12.5 with 75 CC head. I can get dished pistons.. I am considering buying this kit used at a great price so new pistons may not be out of the question. The cam that is with the kit is the largest before a roller cam.. Don't know the exact specs yet. I want this pump gas and steetable.I have drove over cammed motors on the street and its no fun.




It would have to be a smoking deal to have to buy another set of pistons and a cam , though you can sell those extra items .

Re: 500 stroker question [Re: JohnRR] #969032
04/09/11 04:58 PM
04/09/11 04:58 PM
Joined: May 2003
Posts: 6,558
Downtown Roebuck Ont
Twostick Offline
Still wishing...
Twostick  Offline
Still wishing...

Joined: May 2003
Posts: 6,558
Downtown Roebuck Ont
My 493 440Source kit came in at 8.97:1 with a 30something CC dish Ross piston and OOTB Eddies. Gotta like 500hp on regular gas.

Kevin

Re: 500 stroker question [Re: Twostick] #969033
04/10/11 01:00 AM
04/10/11 01:00 AM
Joined: Jan 2003
Posts: 27,421
Balt. Md
3
383man Offline
Too Many Posts
383man  Offline
Too Many Posts
3

Joined: Jan 2003
Posts: 27,421
Balt. Md
I am building a 493 for my 63 and I am using Indy EZ heads. I had to get the dished piston to get my comp down to 10.6. I am using an agressive cam that Dwayne Porter speced for me. It should run fine on 92 or 93 pump. The cam has alot to do with it also as it can have a big affect on cyl pressure which they say keep it below 190 for pump. Ron

Re: 500 stroker question [Re: 383man] #969034
04/10/11 01:02 AM
04/10/11 01:02 AM
Joined: Jan 2003
Posts: 27,421
Balt. Md
3
383man Offline
Too Many Posts
383man  Offline
Too Many Posts
3

Joined: Jan 2003
Posts: 27,421
Balt. Md
Here is the pistons I am using. Ron




Re: 500 stroker question [Re: 383man] #969035
04/10/11 04:57 AM
04/10/11 04:57 AM
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog Offline
Striving for excellence
Kern Dog  Offline
Striving for excellence

Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Quote:

Here is the pistons I am using. Ron








These look almost too nice to hide INSIDE the motor.

Re: 500 stroker question [Re: JohnRR] #969036
04/10/11 10:08 AM
04/10/11 10:08 AM
Joined: Jan 2003
Posts: 738
Columbus Ohio
M
mopfried Offline OP
super stock
mopfried  Offline OP
super stock
M

Joined: Jan 2003
Posts: 738
Columbus Ohio
Quote:

Quote:

The Indy kit I am considering states 12.5 with 75 CC head. I can get dished pistons.. I am considering buying this kit used at a great price so new pistons may not be out of the question. The cam that is with the kit is the largest before a roller cam.. Don't know the exact specs yet. I want this pump gas and steetable.I have drove over cammed motors on the street and its no fun.




It would have to be a smoking deal to have to buy another set of pistons and a cam , though you can sell those extra items .




It is a smoking deal...fresh block .030 over, stroker kit, teo sets of heads two trannys almost everything to assemble for not much more than the stroker kit...

Re: 500 stroker question [Re: mopfried] #969037
04/10/11 10:39 AM
04/10/11 10:39 AM
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
Dodgem Offline
master
Dodgem  Offline
master

Joined: Mar 2008
Posts: 5,746
Ontario, Canada
With a big cam and aluminum heads you can run pretty high compression on 93.
I ran 12 to 1 last year on 94 think I could get by on 91.

Re: 500 stroker question [Re: Kern Dog] #969038
04/10/11 04:45 PM
04/10/11 04:45 PM
Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar Offline
master
451Mopar  Offline
master

Joined: May 2008
Posts: 5,399
Aurora, Colorado
Here is my 17cc dished piston (and pin) for 7.1" rod, 4.25" stroker:

6578428-505piston.jpg (45 downloads)






Powered by UBB.threads™ PHP Forum Software 7.7.1