383 L31 V8 Ole Yellar build
383 L31 V8 Ole Yellar build
I have for a long long time insisted on certain parts based on extensive research.One of those items was Mahle dished pistons which is a special order item with a cost of $639.95 plus 18.00 S&H.
I got a package today:
You know life is full of compromises.I talked for a longtime with a experienced engine builder and my machine shop.We all came to a conclusion that is nice to have a want,but more importantly it is much better to build towards my needs and intended use without giving up reliability.A very good compromise is these pistons.
They are Icon's a forged piston top dished with a 72cc RHS head @ 0 deck will give me a C/R of 9.4 using a 040 head gasket.The desk top dyno along with the rest of the combo will give me these numbers.Torque of 2000 RPM 460 to 480 at 3500 and HP of 340 RPM of 3500 to 4500.Those numbers will be refined as I get closer to the final build.Reason being is as a example I found one series of RHS heads we thought came in a 72cc head and a 170cc intake runner is no longer available.So we will sub in a set of 72cc heads that have a intake runner of 180cc.That will move the band ranges around a little bit.I am still seeking "that" balance point between torque and hp.I am very please with the torque numbers and I do admit they seem to be high VS the HP ratings.
Bottom line.The pistons are going to the machine shop to have us start machining the block and over time get this build back on track.Cool thing is ICON sends a spec sheet given the use for clearances.Towing included.Not sure you can made this out.The ring gap is .0045 and we add .0002 to that.
More to come as we get things done..............
I got a package today:
You know life is full of compromises.I talked for a longtime with a experienced engine builder and my machine shop.We all came to a conclusion that is nice to have a want,but more importantly it is much better to build towards my needs and intended use without giving up reliability.A very good compromise is these pistons.
They are Icon's a forged piston top dished with a 72cc RHS head @ 0 deck will give me a C/R of 9.4 using a 040 head gasket.The desk top dyno along with the rest of the combo will give me these numbers.Torque of 2000 RPM 460 to 480 at 3500 and HP of 340 RPM of 3500 to 4500.Those numbers will be refined as I get closer to the final build.Reason being is as a example I found one series of RHS heads we thought came in a 72cc head and a 170cc intake runner is no longer available.So we will sub in a set of 72cc heads that have a intake runner of 180cc.That will move the band ranges around a little bit.I am still seeking "that" balance point between torque and hp.I am very please with the torque numbers and I do admit they seem to be high VS the HP ratings.
Bottom line.The pistons are going to the machine shop to have us start machining the block and over time get this build back on track.Cool thing is ICON sends a spec sheet given the use for clearances.Towing included.Not sure you can made this out.The ring gap is .0045 and we add .0002 to that.
More to come as we get things done..............
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
Re: 383 L31 V8 Ole Yellar build
Finished machined here with very tight verifiable tolerances.The final hone sizes confirm that fact while fitting the pistons.Off the build sheet I'll give you that result if I can.
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
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- I sleep in my van
- Posts: 431
- Joined: Fri Jun 08, 2007 11:50 pm
- Location: Orange County, CA
Re: 383 L31 V8 Ole Yellar build
I'm excited for you, Gary!
Nice pictures, too.
Nice pictures, too.
-James
1987 LT
249,000 miles
1987 LT
249,000 miles
Re: 383 L31 V8 Ole Yellar build
Thanks James.Still got a ways to go,but it is a start.The rings are next.Looking to get the Mahle plasma molly rings.
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
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- ASV Supporter
- Posts: 1750
- Joined: Sat Jun 16, 2007 2:31 pm
- Location: Toronto, Ontario
- Has thanked: 1 time
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Re: 383 L31 V8 Ole Yellar build
cool awesome to see this long awaited engine being built
1998 GMC Safari AWD, BFGoodrich AllTerrain T/A
Jet performance tuner 91 octane preset, Jet under-drive pulleys
Rancho 999000 series shock, on-board controller to be installed later
DHC rock rails and skid plate Add-A-Leaf
G3500 front calipers
Zexel Torsen Diff
11" drums
180 amp Alternator
Long tru-cool 4590 trans cooler
1997 gone
Jet performance tuner 91 octane preset, Jet under-drive pulleys
Rancho 999000 series shock, on-board controller to be installed later
DHC rock rails and skid plate Add-A-Leaf
G3500 front calipers
Zexel Torsen Diff
11" drums
180 amp Alternator
Long tru-cool 4590 trans cooler
1997 gone
Re: 383 L31 V8 Ole Yellar build
Wow, good price on the slugs for forgies. I hope you mean 4.7 thousandths per inch of bore. Your finals would be 18.894 for the top ring which seems tight to me actually. I may be wrong I'm not exactly the person who's looking at N/A builds for things like this. Are you just going to use stocker Vortecs cut or something else for the heads? Also what length rods I'd think 5.7 but you may have gone with some 6es or 5.85s.
Re: 383 L31 V8 Ole Yellar build
The rods are I bean Scat's 5.7 with ARP 7/16 bolts profiled for a stoker with a Howard's track smart forged crank.The heads are iron RHS Pro Action 72cc with a 180cc intake runner.C/R works out at 0 deck to be 9.4.Rough estimates is 460 to 480 torque from 2000 rpm to 3500 rpm and 350 hp from 2800 rpm to 4800 rpm.I want to upgrade to comp cams roller lifters with will raise the rpm limits over the stock lifters/spider lifter retainers,so the hp ratings as subject to change.The block I am using is a 1995 four bolt main that came threw with the bosses for a roller,but was a flat tappet,so the upgrade is a natural step anyways.The cam is a custom grind for torque.The rings are Mahle plasma moly and the bearing are Kings.I am thinking Edelbrock air gap and I will need your help for a 600 CFM TBI.
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
Re: 383 L31 V8 Ole Yellar build
The rods you're talking about are the capscrew style ones right? Supposedly they make swapping a ton easier than if you just stuck to standard stock style rods. Nice choice on components depending on cam choice I could see 350 being like shooting fish in a barrel with the cubes, heads etc.
Re: 383 L31 V8 Ole Yellar build
Yes the capscrew ones.I need your assistance on a 600cfm TBI/air gap Edelbrock manifold combo.Could you please give me a refresher on that topic??.
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
Re: 383 L31 V8 Ole Yellar build
Here is the computer dyno numbers I had a friend from another site run on this build:
RPM HP TQ
1000 68 358
1500 116 408
2000 172 452
2500 225 472
3000 264 462
3500 301 451
4000 334 439
4500 352 411
5000 348 366
5500 310 296
Peak BMEP 186.1 @2500
RPM HP TQ
1000 68 358
1500 116 408
2000 172 452
2500 225 472
3000 264 462
3500 301 451
4000 334 439
4500 352 411
5000 348 366
5500 310 296
Peak BMEP 186.1 @2500
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
Re: 383 L31 V8 Ole Yellar build
Interesting...1Gary wrote:Here is the computer dyno numbers I had a friend from another site run on this build:
RPM HP TQ
1000 68 358
1500 116 408
2000 172 452
2500 225 472
3000 264 462
3500 301 451
4000 334 439
4500 352 411
5000 348 366
5500 310 296
Peak BMEP 186.1 @2500
Can he also generate some for a factory fresh 05 4.3?
And then run some more numbers on the two motors mpg?
Thanks, Jim
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- I have my van tatooed on my cheeks
- Posts: 4379
- Joined: Sat Sep 09, 2006 3:35 pm
- Location: New Haven, NY
Re: 383 L31 V8 Ole Yellar build
Max torque at 2500 is perfect for towing! Wish my truck made anywhere near that at 2500!
Current rides:
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition
Mileage spreadsheet
Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
2013 Toyota Tundra DC 4x4
2008 Dodge Nitro 4x4
2005 Nissan Sentra 1.8S Special Edition
Mileage spreadsheet
Vans owned:
1986 Safari 2.5L 4 speed manual - scrapped
1995 Astro 2WD conversion 4.11 posi, shift kit, DHC rock rails - sold to Skippy
1998 Astro 4x4 D44, D60, NP231, full hydraulic system with 9k# Milemarker winch and snow plow - sold to Lockdoc
2003 Astro AWD all stock - traded for a 3/4 ton truck
2005 AWD, 4.10's - sold to skippy
Re: 383 L31 V8 Ole Yellar build
Dean-here is the RPM calculator @ 65mph with 3.70 rear end gear,29" tire,1 to 1 in third gear:
http://www.csgnetwork.com/multirpmcalc.html
About 2750 RPM.
Peak hp in O/D without the trailer is 140mph.
Can you imagine going 140 mph in a shortie Astro with a high top???.
No I can't either.
http://www.csgnetwork.com/multirpmcalc.html
About 2750 RPM.
Peak hp in O/D without the trailer is 140mph.
Can you imagine going 140 mph in a shortie Astro with a high top???.
No I can't either.
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
Re: 383 L31 V8 Ole Yellar build
Jim,astroturf wrote:Interesting...1Gary wrote:Here is the computer dyno numbers I had a friend from another site run on this build:
RPM HP TQ
1000 68 358
1500 116 408
2000 172 452
2500 225 472
3000 264 462
3500 301 451
4000 334 439
4500 352 411
5000 348 366
5500 310 296
Peak BMEP 186.1 @2500
Can he also generate some for a factory fresh 05 4.3?
And then run some more numbers on the two motors mpg?
Thanks, Jim
The numbers for a new 4.3 I would think are published on the net somewhere.
With the tune on the 383..........the goal is 18 to 20 mpg.
Jim-you know you want to build a V8.Got's to get wifey's support first of all..........then give up texting,cable tv,high speed internet and go to dial up,the cell has to go,shop for food at Aldi's,the money is there. Oh yeah no fast food stops.Nothing but the food you bought that is at home.
1979 Malibu drag race only car
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY
1999 Sonoma 4.3 5 speed-Rufus
1989 Astro-Ole Yellar cancelled-still selling off parts
1985 Astro-shop van R.I.P. my friend
1994 Astro LT RWD W4.3 rod knock RIP
1982 Winnebago single rear wheel-Chevy 350 Scraped 1/28/13-broken dreams......
Rochester,NY