EMC 2013 470 B stroker build
#1518908
10/17/13 12:28 PM
10/17/13 12:28 PM
|
Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
OP
super stock
|
OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
|
Like title says , I thought seeing what went into this build would be of interest to some so here is what it took to build a budget conscious Mopar stroker for use in the 2013 EngineMaster's Challenge. The 3 main rules were 3000-7000rpm test range, hydraulic lifters, 11.5 comp, 1.75" throttle bore carb (Holley 950 Hp)
At the contest it made peaks of 755 hp and 674 lbs.
Rundown: 400 block circa '75 (short fill), stock steel 440 crank final cubes came in @ 466 Bore 4.361" Stroke 3.900" (small error in offset resulted in .015" less stroke) 6.135" Scat BBC rods Icon 826 pistons with 1.867" CHT CompCam roller 256/260 @.050" .750/.708" 106 LSA Custom 1/2" girdle with aluminum main cap spacers internal oil p-u 1/2" NPT Cloyes Hex-Adjust timing set ProComp heads 2.25" (hollow stem) 1.75" Indy 400-2 intake Schoenfeld 1 7/8-2" dyno/sprintcar headers
This was to be our development engine to beat on trying different parts/configs. I had most of these parts on hand and wanted to get it together, test things out and then build a copy with much nicer parts and a few more tricks with what we learned testing this one. I had this engine running late August and was surprised it made pretty good power considering the low buck nature of it. Our first test up to 6500 rpm netted peaks of 708 hp/638 ft/lbs @ 32 total. Our first pull to 7000 rpm dropped to 508 hp @ 7000 rpm! Due to lifter instability.
I know I am forgetting things to post about this build. Ask away. J.Rob
Last edited by RAMM; 10/17/13 12:55 PM.
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
|
|
|
Re: EMC 2013 470 B stroker build
[Re: RAMM]
#1518909
10/17/13 12:30 PM
10/17/13 12:30 PM
|
Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
OP
super stock
|
OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
|
Here is where most of my attention went. You can see how much angle milling the heads changed the shape of the chambers.
In this shot you cannot see that I relocated the dowel position .100" to move the valves closer to bore centerline. J.Rob
Last edited by RAMM; 10/17/13 12:53 PM.
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
|
|
|
Re: EMC 2013 470 B stroker build
[Re: RAMM]
#1518910
10/17/13 12:34 PM
10/17/13 12:34 PM
|
Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
OP
super stock
|
OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
|
Another shot of the 3.125" intake openings. Flow topped out at 360-363cfm from .700-1.00". I was after stability not flow rates. J.Rob
Last edited by RAMM; 10/17/13 12:52 PM.
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
|
|
|
Re: EMC 2013 470 B stroker build
[Re: RAMM]
#1518911
10/17/13 12:36 PM
10/17/13 12:36 PM
|
Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
OP
super stock
|
OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
|
Here is a shot of how terrible the valve position is. Notice how the valve wants to open right into the exhaust side of the cylinder. J.Rob
Last edited by RAMM; 10/17/13 12:52 PM.
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
|
|
|
Re: EMC 2013 470 B stroker build
[Re: RAMM]
#1518913
10/17/13 12:43 PM
10/17/13 12:43 PM
|
Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
OP
super stock
|
OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
|
The main girdle was probably the most fun and straightforward part of the bottom end. I milled it out from a solid blanchard ground steel. I didn't feel like messing around with some shim arrangement so I milled the tops of the main caps flush with the bolt holes and measured the distance between them and the girdle. Aluminum "cap straps" were made in that dimension fitted per cap to act as the spacer between cap and girdle. I feel that these would still give some of the benefits of a an aluminum cap and still be as stable as an iron cap. I think it worked quite well. J.Rob
Last edited by RAMM; 10/17/13 12:51 PM.
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
|
|
|
Re: EMC 2013 470 B stroker build
[Re: RAMM]
#1518914
10/17/13 12:47 PM
10/17/13 12:47 PM
|
Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
OP
super stock
|
OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
|
Here are the Icon pistons before and after I moved the valve notches back and corrected for angle of the valves. J.Rob
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
|
|
|
Re: EMC 2013 470 B stroker build
[Re: RAMM]
#1518915
10/17/13 12:50 PM
10/17/13 12:50 PM
|
Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
OP
super stock
|
OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
|
Here is a shot of the completed shortblock. You can see the big dish I had to put in the top of the piston. J.Rob
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
|
|
|
Re: EMC 2013 470 B stroker build
[Re: BradH]
#1518920
10/17/13 01:51 PM
10/17/13 01:51 PM
|
Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
OP
super stock
|
OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
|
Yes on the images Brad. I have a hard time making them small enough usually for Moparts--now they are too small.
I would also like to give a big thanks to Rick @ FireCore 50 for his awesome support and products he supplied me. In the very near future I will be doing some A-B-A testing of his ignition products. I am expecting some solid results based on what I have already experienced. J.Rob
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
|
|
|
Re: EMC 2013 470 B stroker build
[Re: RAMM]
#1518921
10/17/13 01:56 PM
10/17/13 01:56 PM
|
Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
|
Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
|
Questions: 1. Got a full-curve flow chart for the heads? 2. Got dyno data for a representative 3000-7000 RPM pull? 3. How did the results from your dyno correlate to the EMC dyno? 4. What did you run for valve springs to support that much lift? 5. What would you change to "detune" it for a more street-friendly & reliable combination? That's all for now...
|
|
|
Re: EMC 2013 470 B stroker build
[Re: RAMM]
#1518922
10/17/13 01:57 PM
10/17/13 01:57 PM
|
Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
master
|
master
Joined: Feb 2011
Posts: 4,302
Nebraska
|
What lifters did you end up using?
Mopar to the bone!!!
|
|
|
Re: EMC 2013 470 B stroker build
[Re: RAMM]
#1518923
10/17/13 01:58 PM
10/17/13 01:58 PM
|
Joined: Feb 2006
Posts: 1,051 The Great White North
RAMM
OP
super stock
|
OP
super stock
Joined: Feb 2006
Posts: 1,051
The Great White North
|
I would also like to thank my buddy Joe who did such a nice job on the crank. This crank was a 40+ year old 440 steely that I tig'd the undercuts on the rods up and he offset ground and cut .300"+ from the counterweights. We profiled and cleaned the counterweights up as well. It took 2 slugs of Mallory to get it to balance. Bobweight was 2268g, no lightweight here. J.Rob
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
|
|
|
|
|