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Author Topic:   Maximum RPM ???
Clevo377
Journeyman

Posts: 86
From: Blackburn, Victoria, Australia
Registered: Nov 2000

posted 11-27-2000 01:46 AM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
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

posted 11-27-2000 02:16 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
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

posted 11-27-2000 03:33 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
"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

posted 11-27-2000 03:34 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
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

posted 11-27-2000 05:47 PM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
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

posted 11-27-2000 06:42 PM     Click Here to See the Profile for Santa Claus     Edit/Delete Message   Reply w/Quote
Paul,
Welcome to M&M
SANTA

Those 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

posted 11-27-2000 06:44 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote

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

posted 11-27-2000 07:48 PM     Click Here to See the Profile for Nos351C   Click Here to Email Nos351C     Edit/Delete Message   Reply w/Quote
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

posted 11-27-2000 08:00 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
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

posted 11-27-2000 08:06 PM     Click Here to See the Profile for mustangs68   Click Here to Email mustangs68     Edit/Delete Message   Reply w/Quote
Paul welcome to M&M...
sam

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steve'66
Gearhead

Posts: 2074
From: Sonoma,CA,USA
Registered: Mar 2000

posted 11-27-2000 11:46 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
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

posted 11-28-2000 03:15 AM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
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

posted 11-28-2000 04:19 AM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
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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