Author
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Topic: Maximum RPM ???
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Clevo377 Journeyman Posts: 86 From: Blackburn, Victoria, Australia Registered: Nov 2000
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posted 11-27-2000 01:46 AM
I have just finished building a 377 Cleveland and would like to find out if I reached my HP goal of 500 - 550HP. When I designed my engine I was counting on a redline of 7300 RPM. According to what I have read elsewhere a max piston speed of 4000fpm (~6600RPM) should be adhered to. The engine is being used mainly on the street. At present I have a 6000RPM limit in my MSD, the rest of the motor (induction, valvetrain etc) is designed for a torque peak of ~5500rpm and top HP @ ~7000rpm. Before i get it dynoed for max HP I want to be sure i treat it nice (don't feel like rebuilding just yet). If you like a long list...read on - Some specs are as follows:Block - 1970 USA (std bore) 2 bolt main caps Remove casting flash Open oil passages (see below) Radius main bearing saddles, webs and caps Hot tank Crack test Install ARP Main studs Align hone main bearing channel Square deck to 9.190" Bore and torque-plate hone 0.030" Install oil restricter kits Fit bush to suit electronic distributor Cam bearings = Clevite (std) Oil Pump = Mellings (std Vol) + pickup, welded pickup in place Oil feed - LHS gallery to mains = 3/8" Oil feed - filter to LHS gallery = 9/16" Oil feed - from pump to filter = 9/16" Oil feed - RHS gallery to N0. 1 main = 9/16" Oil feed - RHS gallery to N0. 2-5 main = 3/8" Oil return - from heads = 10.000mm Oil return - from lifter valley = 10.000mm Oil restrictors - LH gallery = 3/32" Oil restrictors - Cam bearings (5) = 1/16" Crankshaft - 351 4MAB Cracktest Remove casting flash and radius all edges Crossdrill Stroke to 3.70" Open webs to suit Chev rods Champher oil holes Main Bearings - Clevite 77 "P" series Balance rotating assembly Con rods - Eagle "ESP" H beam 4340 SBC 5.7" Conrod Bearings - Clevite 77 "P" series (Chev) Champher conrod bearings Pistons - ACL Duralite - Cleveland 377 Clearanced for stroker Machined to be full floating ACL filefit Moly rings Polish domes Compression height = 1.640" Top ring width = 1.50mm Top ring end gap = 0.016" Second ring width = 1.50mm Second ring end gap = 0.018" Oil ring width = 4.00mm Piston to Inlet valve = 0.058" Piston to Exhaust valve = 0.180" Weight of piston&pin = 540gm Heads - Ford 4V 1970 - 1971 Closed chamber Pocket ported Valve guide bosses minimised Inlet ground to remove pushrod bump Exhaust ground to remove pushrod bump Modified to suit bigger springs Modified to suit 3/8 pedestal mount roller rockers Exhaust ports polished Machined guides for teflon seals Intake tongues fitted Exhaust tongues fitted Inlet and Exhaust valves unshrouded Polished combustion chambers Head studs Seats and guides reconditioned Detailed seat area (removed any lip) CC'd to 60cc Valvetrain - Crow Cams / Yella Terra Camshaft - Crow 21731 (Solid grind) Inlet-duration = [email protected], Lift = 0.615" Exhaust-duration = [email protected], Lift = 0.632" Lifters = Crow AT2000 (solid) Push rods = Chromoly 5/16", 0.080" wall, 1 piece, Crow PR5845 Rocker arms = Roller, 1.73:1 ratio, 3/8 stud, Yella-Terra YT5039 Inlet valves = 2.19 stainless steel, swirl polished, single groove Exhaust valves = 1.71 stainless steel, swirl polished, single groove Valve springs = Double, Crow 7331 Retainers = Molybendium, offset 0.1", Crow 12700 Locks = Machined, Crow 11705 Valve stem seals = Teflon Crane Timing gear = JP Gear Set (+ Line bore kit) Valvespring installed height = 1.9260" Valve Lash (hot) = 0.0210" Inlet Manifold - Funnelweb (Rousch type) Match ported to suit tongues Spacer - 2" open Carburettor - Holley 850 DP Primary = 4.5" PV, 78 Jet Secondary = 4.5"PV, 80 Jet Exhaust - 4V 4 into 1 extractors 2" primarys 38"long 3.5"collectors Twin 2.5"system with Walker Ultra-Flow mufflers Sump - Russel. Box style with windage tray & crank scraper Ignition - MSD 6AL and Blaster 2 coil Any comments welcomed.
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Moneymaker Administrator Posts: 8393 From: Lyons, IL, USA Registered: May 99
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posted 11-27-2000 02:16 PM
Welcome to M&M Clevo ! Sounds like a nice package. Your engine dyno operator should be able to get a feel for what the maximum RPM will be. With that very good valve train, I suspect that it will max out at somewhere in the 7000 RPM range. Alex------------------ Alex Denysenko Co-Administrator and Moderator Fleet of FoMoCo's too long to list! http://superstockers.homestead.com/week.html
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SteveLaRiviere Administrator Posts: 14060 From: Saco, Maine MCA # 47773 Registered: May 99
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posted 11-27-2000 03:33 PM
"Crossdrill"Didn't they stop crossdrilling '69 Boss 302 cranks because of breakage problems? "Intake tongues fitted Exhaust tongues fitted "
Are you going to dyno your motor with and without these? I'd love to see the difference. ------------------ SteveLaRiviere/Webmaster -- MCA # 47773 Speak softly, but carry a big camshaft!
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SteveLaRiviere Administrator Posts: 14060 From: Saco, Maine MCA # 47773 Registered: May 99
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posted 11-27-2000 03:34 PM
By the way, welcome to M&M. That makes three members from Australia, now! ------------------ SteveLaRiviere/Webmaster -- MCA # 47773 Speak softly, but carry a big camshaft!
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Clevo377 Journeyman Posts: 86 From: Blackburn, Victoria, Australia Registered: Nov 2000
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posted 11-27-2000 05:47 PM
Thanks for the welcome guys Alex, In your opinion, regarding piston speed, what would the maximum RPM be? As mentioned in my post the theoretical "safe" maximum piston speed occurs at 6600RPM, lower than where I was hoping for. How important is this figure (4000fps) given todays parts, and more specifically the parts I'm using?? Ultimately my maximum RPM will be governed by the point at which max HP occurs (I'm hoping for ~7000RPM) but this won't ne much good to me if the thing does'nt hold together . Steve, The fitting of the intake tongues makes them an intergral part of the port as some grinding of the port entrance was performed. Mainly at the top. So a comparison cannot be made. The exhaust is a different story though. I'll see how I go with the dyno test. If I reach my goal I'll go with the saying "leave well enough alone", otherwise I'm up for some experimentation . Paul
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Santa Claus Moderator Posts: 28 From: North Pole Registered: Nov 2000
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posted 11-27-2000 06:42 PM
Paul, Welcome to M&M SANTAThose summer are warm there!! [This message has been edited by Santa Claus (edited 11-27-2000).]
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steve'66 Gearhead Posts: 2074 From: Sonoma,CA,USA Registered: Mar 2000
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posted 11-27-2000 06:44 PM
I didn't know you were Santa Claus!! Now that the secret is out, I'll e-mail you my list!! SteveW p.s. Message edited to protect Santa's privacy!!! [This message has been edited by steve'66 (edited 11-27-2000).]
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Nos351C Gearhead Posts: 3000 From: Rohnert Park, CA USA M&M member#591 Registered: Jul 2000
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posted 11-27-2000 07:48 PM
Ya know Santa is a big guy, I wonder how he gets all the way to Australia? BTW, Welcome to M&M Clevo Now where did Peter get to? ------------------ Marcus End racism...kill everyone Some people are alive only because it's against the law to kill them (credit SteveW) If you must burn our flag, please wrap yourself in it first. If you don't like the way I drive, get off the sidewalk!
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SteveLaRiviere Administrator Posts: 14060 From: Saco, Maine MCA # 47773 Registered: May 99
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posted 11-27-2000 08:00 PM
quote: Originally posted by steve'66:
I didn't know you were Santa Claus!! Now that the secret is out, I'll e-mail you my list!! SteveW p.s. Message edited to protect Santa's privacy!!! [This message has been edited by steve'66 (edited 11-27-2000).]
Phew!! I was going to say "You are so screwed, SteveW!" But I see you edited your expose' on Mr. Claus. ------------------ SteveLaRiviere/Webmaster -- MCA # 47773 Speak softly, but carry a big camshaft!
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mustangs68 Moderator Posts: 10785 From: Buckroe Beach,Virginia,USA 1968 Fastback & 1995 Vert MCA#39406 M&M #12 Registered: May 99
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posted 11-27-2000 08:06 PM
Paul welcome to M&M... sam
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steve'66 Gearhead Posts: 2074 From: Sonoma,CA,USA Registered: Mar 2000
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posted 11-27-2000 11:46 PM
Yeah SteveL,I almost blew his cover!! Wheew, that was a close one1 But at least I finally figured out who Santa is!! LOL It's been a life long pursuit! HaHa I know who you are!!! SteveW
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TomP Moderator Posts: 2262 From: Delta BC Canada Registered: Dec 99
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posted 11-28-2000 03:15 AM
It oughta be no problem at 7000, but above 7500 would be pushing things. I'd stick a 7000 chip in the MSD. The weak links could be the offset crank and the cylinder wall thickness, so if max power can be made below 7000 there is no need to push it much higher. Is Funnelweb an Australian brand name?
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Clevo377 Journeyman Posts: 86 From: Blackburn, Victoria, Australia Registered: Nov 2000
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posted 11-28-2000 04:19 AM
Thanks Tom, If my sums are correct I should make peak torque at around 5500 RPM so I expect to make peak HP around 6500 - 6800. The funnelweb is made by Terry Parker here in Aus. Dan Jones gives it a mention in the archives. Paul
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