Cam opinions wanted. - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 02-03-2011, 11:33 PM
Registered User
 
Join Date: Jan 2011
Location: Nebraska
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Cam opinions wanted.

Does anyone have experience with the Crane Cams Powermax hydraulic roller cams?
I am looking at this cam for my Chevy 383 build,
part number: 119701
Grind Number HR-222/345-2S-12.90 IG
Duration at 050 inch Lift
222 int./230 exh.
Advertised Duration
288 int./296 exh.
Valve Lift with Factory Rocker Arm Ratio
0.518 int./0.539 exh.
lsa 112
I am most likely going to be going with AFR 195cc heads, performer rpm air gap,750 cfm 4 bbl carb.
Engine is most likely going to go in an 81 Monte Carlo. the tranny needs rebuilt, so i can match the stall converter to what is needed.

here are the numbers fromDTD2k
RPM HP TQ
2000 189 495
2500 239 501
3000 289 507
3500 339 508
4000 381 501
4500 415 484
5000 435 457
5500 436 416
6000 418 365
6500 384 310
7000 343 257
7500 300 210

The engine will most likely not see the north side of 6000 rpm's.
Static comp ratio is 11.08 and dynamic comp ratio is 8.10
I have also been considering the 1 smaller cam in this line, the
Grind HR-216/339-2S-12.90 IG part #119671
RPM HP TQ
2000 192 504
2500 241 506
3000 291 509
3500 336 504
4000 375 493
4500 404 471
5000 417 437
5500 414 395
6000 385 337
6500 352 284
7000 306 229
7500 260 182
SCR = 10.95:1 DCR=8.16:1

had to drop SCR a little to get the DCR under 8.25:1
Not sure what my rear gear ratio is, probably what ever was stock in an 81 Monte.

your thoughts and opinions are welcome.

Thanks,
Michael

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-04-2011, 07:00 PM
jeffery wells's Avatar
Registered User
 
Join Date: Jan 2011
Location: ohio
Posts: 41
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
wow, you've been here before huh, lol, and the only BAd experience i've had with those is when i pulled one out only to find that it hadn't been tightened down all the way, and it snapped. but still, not the cams fault, the guy just didn't know what he was doing, but i haven't had any problems with em, for the most part there a good choice, i would go with lunati, but that's just me.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-05-2011, 09:48 PM
Registered User
 
Join Date: Jan 2011
Location: Nebraska
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Jeffery,
Well, I haven't been here long, but I have read enough old posts, and been on enough forums to know it is best to give hopefully enough info to get some help, no point in wasting mine, and other's time with silly questions that could have all been put in the first post.

Thanks for the Lunati direction. I forgot about them, last time I build an engine, over 10 years ago, Crane and Comp cams were the big players, not to say they aren't now, but people seem to be looking other directions.

I will run a few of their cams through DTD2k and see what I come up with. Any particular one you think I should consider? Their prices seem to be less then Crane Cams.

Thanks,
Michael
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-06-2011, 11:38 AM
jeffery wells's Avatar
Registered User
 
Join Date: Jan 2011
Location: ohio
Posts: 41
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
f-bird is hitting the nail on the head with having the cam grinded and custom fit for your application, however, if your looking for something with throttle response, acceleration, and not so bad at the pump in a daily driver, the lunati hydraulic 262 will give you a higher rpm range and set down you lifters a little easier for a quieter operation. this cam will give you that aggressive sound and performance of a classic rodder without breaking your bank account, but of course, these are all just suggestions, in the end it's up to you decide what you want out of your car.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 02-06-2011, 10:06 PM
Registered User
 
Join Date: Jan 2011
Location: Nebraska
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
F-BIRD'88,
hi, thanks for the good info. I actually setup my own excel spreadsheet for all my calculations, I don't have to go back and forth between different websites to refigure stuff if I make one change. I got the formulas for DCR from http://www.empirenet.com/pkelley2/DynamicCR.html.
Granted I am not taking in to account the bore and piston clearance, or the space above the top ring to the top of the piston, but that should not change my ratios to much, not enough on a street engine at least.

Thanks for pointing out Cranes seat to seat of .004. I guess I read that, but didn't think much of it. Could that make a difference of more than a degree or to for the intake closing though? A call to Crane might be in order though, just to get the .006 info.

even with aluminum heads, and a DCR of less then 8.25, you think 11:1 is to high of a SCR for 91-93 octane? Well, if I go with the 70cc heads, that will get me 10.36 SCR which would be about 7.59 SCR with the HR-222/345-2S-12.90 IG cam, and the HR-216/339-2S-12.90 IG cam is 7.74 DCR, using Crane's seat to seat numbers.

Good quality is worth the extra in my mind. If I go with the Crane cam and roller lifters, that will cost more than my crank, rods, and pistons. Seems kind of weird. But, if I am not going to push out 800 poneys, I see no point buying an $800 crank.

I am glad to see what you recommended for rear gears, that was about the same range I was considering. at 65 MPH with 28 tires 3.73 gears I would be around 2900 RPM's. I will most likely stay with the TH350 or TH400 I already have, unless I can find a 700r4 for a good price. Not sure where the cruise RPM needs to be in relation to my torque curve though, but that is a little off from the cam discussion of this thread.

using the estimated 275/283, DTD2K calculated the intake closing at 64 degrees ABDC, which I guess is a huge difference from their advertised 75 degrees. But DTD2K figured the closing at 71 degrees with their advertised durations, so something is not quite on somewhere. if the 64 is about right, I will need to drop my SCR to about 10.15 to get a DCR of 8.16.

A custom ground cam is a possibility, I like what changing the LSA to 108 does on the estimated Hp and torque.
HR-222/345-2S-12.90 IG cam
with 108 LSA and 1.6 intake rocker ratio
2000 183 480
2500 230 483
3000 279 488
3500 326 489
4000 372 488
4500 410 479
5000 435 456
5500 446 426
6000 434 379
6500 413 334
7000 377 283
7500 344 241

HR-216/339-2S-12.90 IG cam
with 108 LSA and 1.6 intake rocker ratio
2000 188 493
2500 235 494
3000 283 496
3500 330 495
4000 370 486
4500 404 471
5000 426 448
5500 430 411
6000 415 363
6500 387 312
7000 348 261
7500 308 215

I will definitely be calling Crane to get the .006 specs and such.

Thanks,
Michael
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Opinions wanted shadetree builder Body - Exterior 3 04-11-2010 09:42 PM
Opinions wanted SVOHIO Body - Exterior 5 12-23-2006 11:19 AM
Opinions wanted ... Thanks !! Gr8lite Hotrodding Basics 5 07-14-2005 09:36 AM
Opinions wanted willowbilly3 Body - Exterior 5 06-01-2005 03:46 AM
opinions wanted Lightspeed Body - Exterior 12 10-07-2002 07:38 AM


All times are GMT -6. The time now is 10:25 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.