need help with scr dcr
Veteran
Joined: Oct 2005
Posts: 1,284
Likes: 81
From: Nashville, TN
Ok, Thanks for those that offered to help! Her is my info: Crank Stroke 3.75, Rod length 6", ADV intake closing angle ??????? Intake duration 287, exhaust duration, 293, LSA 114, ICL 110, Int. Open 8, Ex. Open 59, int. closed 48, ex. closed 3, Bore diameter 4.030, stroke 3.75, head CC 74, gasket thickness .040, gasket bore 4.060, deck height 0.00, flat top pistons with 5 cc valve relief, quench .040. If any more info is needed let me know! If possible check advanced 4 and retarded 4. Thanks Kevin
Veteran
Joined: Oct 2005
Posts: 1,284
Likes: 81
From: Nashville, TN
Havn't milled the deck yet, plan is to have 0.015.
I will yse a 0.029 gasket.
Did you use a 0.039 gasket to get these numbers?
If I retard the cam 4*, how will this affect the dcr?
Anyway I have decided to go for the bigger XE280 cam, just to be on the safe side with the dcr.
If I type in the XE280 values, I get the same dcr, very strange!
Should change, as the IVC is different!
I will yse a 0.029 gasket.
Did you use a 0.039 gasket to get these numbers?
If I retard the cam 4*, how will this affect the dcr?
Anyway I have decided to go for the bigger XE280 cam, just to be on the safe side with the dcr.
If I type in the XE280 values, I get the same dcr, very strange!
Should change, as the IVC is different!
these numbers were based on the .029 gasket you said you were using, for some reason the dcr stroke cam out lower for me using your numbers.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Can anybody run the 4 degree advanced and 4 degree retard numbers for me to see if I can salvage this thing. I might have to sell my new AFR heads or rethink my cam choice. Bad information is worse than none sometimes.
Last edited by 63mako; Feb 18, 2007 at 05:56 PM.
Racer
Joined: Oct 2004
Posts: 285
Likes: 0
From: Stockholm
Ha!
Finely I found the solution!
When I changed my settings from "Swedish" to "English United States" in the Control Panel settings it started to work as it should!
The pgm can't handle different decimal separators!
The XE280 gives dcr 8.9 and with the cam 4* retard 8.5
Now I can order that new cam without beeing worried
Finely I found the solution!
When I changed my settings from "Swedish" to "English United States" in the Control Panel settings it started to work as it should!
The pgm can't handle different decimal separators!
The XE280 gives dcr 8.9 and with the cam 4* retard 8.5
Now I can order that new cam without beeing worried
Last edited by gbak; Feb 18, 2007 at 06:47 PM.
Le Mans Master
Joined: Mar 2004
Posts: 7,502
Likes: 1,509
From: Little Rock AR
That really sucks!!! I designed this build according to the KB DCR site which put me at a safe 8.2. Now I realize I am at a doggy 7.4 with a $375 custom ground cam I can't return Can anybody run the 4 degree advanced and 4 degree retard numbers for me to see if I can salvage this thing. I might have to sell my new AFR heads or rethink my cam choice. Bad information is worse than none sometimes.
Can anybody run the 4 degree advanced and 4 degree retard numbers for me to see if I can salvage this thing. I might have to sell my new AFR heads or rethink my cam choice. Bad information is worse than none sometimes.Looks like about 9.9:1 SCR with a 7.4 DCR so I have to agree with The King. A little bit too low IMHO. I tossed out your intake and exhaust opening and closing events as I suspect they are @.050" or some other lift point but we need seat to seat numbers there. I just went with the advertised duration and lobe centerlines to get to the actual open and close points.
You might like a little less cam in there or a swap to a smaller head might work. 64cc heads would put you at 11:1 SCR and 8.23 DCR. Right in the zone
-Mark.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Kevin,
Looks like about 9.9:1 SCR with a 7.4 DCR so I have to agree with The King. A little bit too low IMHO. I tossed out your intake and exhaust opening and closing events as I suspect they are @.050" or some other lift point but we need seat to seat numbers there. I just went with the advertised duration and lobe centerlines to get to the actual open and close points.
You might like a little less cam in there or a swap to a smaller head might work. 64cc heads would put you at 11:1 SCR and 8.23 DCR. Right in the zone
-Mark.
Looks like about 9.9:1 SCR with a 7.4 DCR so I have to agree with The King. A little bit too low IMHO. I tossed out your intake and exhaust opening and closing events as I suspect they are @.050" or some other lift point but we need seat to seat numbers there. I just went with the advertised duration and lobe centerlines to get to the actual open and close points.
You might like a little less cam in there or a swap to a smaller head might work. 64cc heads would put you at 11:1 SCR and 8.23 DCR. Right in the zone
-Mark.
KB calculator sucks!!!
My #s are seat to seat. Anybody want to buy a brand new $1400 set of 74 CC Afr 190 heads still in the box? $1250!
Last edited by 63mako; Feb 18, 2007 at 08:49 PM.
Melting Slicks
Joined: Jul 2005
Posts: 2,060
Likes: 46
From: winter haven florida
St. Jude Donor '12
what is the part number on the heads i am in the market for my build. do you have the flow numbers on them?
Last edited by 2000FRCZ19; Feb 18, 2007 at 09:29 PM.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Last edited by 63mako; Feb 18, 2007 at 09:50 PM.
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Le Mans Master
Joined: Oct 2001
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From: Wildwood IL
Melting Slicks
Joined: Jul 2005
Posts: 2,060
Likes: 46
From: winter haven florida
St. Jude Donor '12
1001. Here is the specs on the AFR site.http://www.airflowresearch.com/190sbc_sh.php These are marked 2.05 and 1.60. The AFR site says they are 2.02 and 1.60 valves. I bought these from Sallie Chevrolet, Now Gilbert Chevrolet. Think they were special order not picked up. All ports and chamber fully CNC machined.
Race Director
Joined: May 2005
Posts: 10,674
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From: Millington Illinois
St. Jude Donor '08-'09
I could mill them but I would have to take .054 off each deck to get the comp I need to run my cam. Might end up doing that since AFR is 12 weeks out on the new heads.
Last edited by 63mako; Feb 18, 2007 at 10:51 PM.
Burning Brakes
Joined: Oct 2006
Posts: 1,089
Likes: 43
From: Native Californian CALIFORNIA
Army
Jackson since Mako is done can you lend a hand. I have a 350/300 1969 I want to rebuild close to stock. This is what I have know:
Crane Cam #113522
Lift: Intake@cam 306, @ valve 459
Exhaust @ Cam 324, @ valve 486
Rocker Arm Ratio 1.5
Cam Timing Tappet @.004
Intake opens 25.0 BTDC Closes 63.0 ABDC ADV Duration 268
Exhaust Opens 75.0 BBDC Closes 25.0 ATDC ADV Duration 280
Cam Timing Tappert @.050
Intake Opens 2.0 BTDC Closes 36.0 ABDC Max Lift 107 218 Duration
Exhaust Opens 52.0 BBDC Closes (2.0) BTDC 117 Max Lift 230 Duration
LSA: 112
Block: Bored 4.042 over
Piston: KB 106 Flattop volume listed at 7cc, they make a 11cc if needed
Heads: 7041's machine shop cc'ed at 62cc
Felpro head gasket # 1043 Bore 4.080 Thickness .039
Rods; 5.7
Stroke: 3.48
Deck height: .015
Help with the SCR\DCR is gresatly appreciated
Crane Cam #113522
Lift: Intake@cam 306, @ valve 459
Exhaust @ Cam 324, @ valve 486
Rocker Arm Ratio 1.5
Cam Timing Tappet @.004
Intake opens 25.0 BTDC Closes 63.0 ABDC ADV Duration 268
Exhaust Opens 75.0 BBDC Closes 25.0 ATDC ADV Duration 280
Cam Timing Tappert @.050
Intake Opens 2.0 BTDC Closes 36.0 ABDC Max Lift 107 218 Duration
Exhaust Opens 52.0 BBDC Closes (2.0) BTDC 117 Max Lift 230 Duration
LSA: 112
Block: Bored 4.042 over
Piston: KB 106 Flattop volume listed at 7cc, they make a 11cc if needed
Heads: 7041's machine shop cc'ed at 62cc
Felpro head gasket # 1043 Bore 4.080 Thickness .039
Rods; 5.7
Stroke: 3.48
Deck height: .015
Help with the SCR\DCR is gresatly appreciated
Last edited by SoCalErv; Feb 19, 2007 at 10:48 AM.
Racer
Joined: Oct 2004
Posts: 285
Likes: 0
From: Stockholm
Curious ... who is mfg & what is P/N for that 0.029 gasket?
http://store.summitracing.com/partde...4&autoview=sku
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
KB silvolite
I e-mailed and called their customer service and Tech lines a couple hours ago and left a message explaining the situation with their calculator. We will see how they respond to their customers! Maybe their's is right. I patterned my build off the engine on AFR's website. bumped the static compression .35 and opened up the LSA 4 degrees to work better with my nitrous, widen the torque band and reduce overlap for even more DCR. I would think AFR would dial in the correct DCR on their test engine to obtain optimum power and not be running a test engine with less than 7.4 DCR????
Last edited by 63mako; Feb 19, 2007 at 08:04 PM.
Drifting
Joined: Apr 2002
Posts: 1,716
Likes: 4
From: New Baden Illinois
I could also use some help. Here are the specs:
3.75 stroke
64cc chamber
12cc pistons (dish)
head gasket .028/4.130
deck clearance .025
5.7 rods
Cam specs:
LSA - 112
ICL - 107
ADV dur - 272
Timing at .004
IO - 25; IC - 67
EO - 75; EC - 29
Let me know if you need any additional info. I must be doing something wrong because it keeps spitting out 9.4 DCR.
Thanks.
3.75 stroke
64cc chamber
12cc pistons (dish)
head gasket .028/4.130
deck clearance .025
5.7 rods
Cam specs:
LSA - 112
ICL - 107
ADV dur - 272
Timing at .004
IO - 25; IC - 67
EO - 75; EC - 29
Let me know if you need any additional info. I must be doing something wrong because it keeps spitting out 9.4 DCR.
Thanks.
Veteran
Joined: Oct 2005
Posts: 1,284
Likes: 81
From: Nashville, TN
I could also use some help. Here are the specs:
3.75 stroke
64cc chamber
12cc pistons (dish)
head gasket .028/4.130
deck clearance .025
5.7 rods
Cam specs:
LSA - 112
ICL - 107
ADV dur - 272
Timing at .004
IO - 25; IC - 67
EO - 75; EC - 29
Let me know if you need any additional info. I must be doing something wrong because it keeps spitting out 9.4 DCR.
Thanks.
3.75 stroke
64cc chamber
12cc pistons (dish)
head gasket .028/4.130
deck clearance .025
5.7 rods
Cam specs:
LSA - 112
ICL - 107
ADV dur - 272
Timing at .004
IO - 25; IC - 67
EO - 75; EC - 29
Let me know if you need any additional info. I must be doing something wrong because it keeps spitting out 9.4 DCR.
Thanks.
Last edited by King Lear; Feb 19, 2007 at 07:57 PM.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I e-mailed and called their customer service and Tech lines a couple hours ago and left a message explaining the situation with their calculator. We will see how they respond to their customers! Maybe their's is right. I patterned my build off the engine on AFR's website. bumped the static compression .35 and opened up the LSA 4 degrees to work better with my nitrous, widen the torque band and reduce overlap for even more DCR. I would think AFR would dial in the correct DCR on their test engine to obtain optimum power and not be running a test engine with less than 7.4 DCR????
Race Director
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From: Corsicana, Tx
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Just for clarification....overlap doesn't have anything to do with DCR. It occurs at wrong end of the 4 strokes. Both valves are open...there is no compression happening right then.
JIM
JIM
Veteran
Joined: Oct 2005
Posts: 1,284
Likes: 81
From: Nashville, TN
Yep, I just reported Eagle to the BBB Saturday, I am done playing phone tag. I figure if I can recover any of my money through them then great. If not then I still have to fix it anyway.
Last edited by King Lear; Feb 22, 2007 at 10:17 AM.