482" Street SOHC Specifications

[jayb]

More information on this build can be found at the following link:

http://fepower.net/simplemachinesforum/index.php?topic=6368.0

Performance Summary:
      Cubic Inches:    482           Dyno brand:  Superflow 901
      Power Adder:    None           Where dynoed:  FE Power
      Peak Horsepower:  715
      Peak Torque:   587

Horsepower and Torque Curves:







Engine Specifications:
   Block brand, material, finished bore size, other notes:  BBM cast iron block, 4.25" bore, block not drilled for oil drainbacks for the SOHC, external drainbacks used
     
   Crankshaft brand, cast or forged, stroke, journal size:  Scat forged 4.25" stroke, BBC rod journals
     
   Connecting Rods brand, material, center to center distance, end sizes, bolts:  Scat H-Beam BBC rods, 6.700" center to center

   Piston brand, material (caster, hypereutectic or forged), dish/dome volume, static CR:  Diamond forged pistons, 35.5cc dome, zero deck, 11.5:1 static compression ratio

   Main Bearings, Rod Bearings, Cam Bearings brand and size:  Federal Mogul 125M 3/4  groove main bearings, Clevite CB-743HNK coated rod bearings, Durabond sideoiler cam bearings, standard SOHC cam bearings for the heads

   Piston rings brand, size, other notes:  Hastings ring package 09024250, 1/16 - 1/16 - 3/16 rings, Moly top ring, cast second, chrome oil rings.  Support rail for oil rings required.

   Oil Pump, pickup, and drive:  Precision Oil Pumps high volume oil pump with 5/16" hex, standard spring, heavy duty pump drive, Canton pickup for cast aluminum Cobra oil pan

   Oil pan, windage tray, oil filter adapter:  Cast aluminum Cobra oil pan, Moroso louvered windage tray, Precision Oil Pumps oil filter adapter with two pipe thread outlets, one used for feeding oil externally to the cylinder heads, the other for the oil pressure gauge

   Camshaft brand, type (hyd/solid, flat tappet or roller), lift and duration (adv and @.050")  Comp 8594 lobes on both intake and exhaust, 300 adv duration, 277
@0.050" lobe lift, 0.723" gross valve lift, 112 LSA, right cam degreed at 107, left cam degreed at 109

   Lifters brand, type:  Who needs lifters??

   Timing chain and timing cover:  Complete Robert Pond Motorsports timing set with the pre-stressed secondary chain and 0.250" roller pins.  Comp Cams stub cam.  Robert Pond Motorsports timing cover.

   Cylinder heads brand, material, port and chamber information:  Robert Pond Motorsports aluminum heads, 120cc combustion chamber

   Cylinder head flow in cfm at inches of lift (28" H2O pressure drop):
      Intake               Exhaust
      .100       71        .100     56
      .200      158       .200   128
      .300      239       .300   195
      .400      304       .400   243
      .500      353       .500   262
      .600      375       .600   268
      .700      375       .700   271
      .800               .800

   Flow bench used, location:  Superflow 600 Bench at R&R Performance

   Intake valve brand, head size, stem size:  Ferrea 2.300", 11/32 hollow stem

   Exhaust valve brand, head size, stem size:  Ferrea 1.900", 11/32 hollow stem
   
   Valve springs brand, part number, specs:   Comp 943 springs, 220 pounds on the seat, 585 at .700" lift

   Retainers and locks brand, part number, specs:  Comp tool steel retainers, Manley machined steel locks

   Rocker arm brand, type (adjustable or non-adj), material, ratio:  FE Power non-adjustable SOHC rockers, roller tip, 4130 steel, 1.3:1 ratio

   Rocker shafts and stands, brand, material:  Rocker shafts from T&D Machine, spring clips from T&D Machine

   Pushrods brand, type, length:  Just say no to pushrods!

   Valve covers, brand, type:  Unknown brand, acquired from customer, powder coated

   Distributor brand, advance curve information:  No distributor, stock distributor modified for oil pump drive only, Crane steel distributor gear

   Harmonic balancer brand:  Romac fully degreed balancer

   Water pump brand, type (mechanical or electric):  CVR Pro-Flow extreme electric water pump with FE Power water pump adapters

   Intake manifold brand, material, porting information:  Hilborn mechanical FI manifold, modified for electronic fuel injection

   Carburetor(s) brand, type:  NA

   Exhaust manifolds or headers brand, type:  Custom SOHC dyno headers

[cjshaker]

"Who needs lifters?"

First, nice build. That is one heckuva torque curve...or lack of curve! Should be able to get him to the grocery store in record time.
Couple questions; One, why do you think you couldn't get the idle acceptable at a lower RPM, like on your engine? Just wondering if you had a theory to that. Second, are Mr. Munro's timing chains no longer being produced? I know you've used them in the past, and they were of a heavier design, so guessing that nobody picked up where he "left off", or are Mr. Ponds pieces of a heavier design also?

[e philpott]

Sweet street  engine  !! .... Should be a sweet Galaxy that I will add to the " do not race against at the stop light List " lol

[jayb]

"Who needs lifters?"

First, nice build. That is one heckuva torque curve...or lack of curve! Should be able to get him to the grocery store in record time.
Couple questions; One, why do you think you couldn't get the idle acceptable at a lower RPM, like on your engine? Just wondering if you had a theory to that. Second, are Mr. Munro's timing chains no longer being produced? I know you've used them in the past, and they were of a heavier design, so guessing that nobody picked up where he "left off", or are Mr. Ponds pieces of a heavier design also?

I think the extra 100 cubic inches of my 585" SOHC made it easier for it to idle a little lower.  I could have probably played with the timing and fuel curve a little more to try to stabilize it at a lower speed, but 900 RPM was really where it seemed to want to sit, so I left it like that.

Pond's timing set is very similar to Munro's, and since Munro is incarcerated now I'm not sure if those parts are even available.  Both of those sets used a full roller chain (unlike the non-roller chain used in the stock SOHCs and a lot of the aftermarket ones), and also the gears are machined for the larger 0.250" pin, not the 0.222" pin that the originals used.  Basically, the Pond set and the Munro set were identical, although Robert's chain is supposed to be pre-stressed to eliminate most of the stretch.  I think the Pond setup is just as strong as Munro's was, and I have no reservations about using it.