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Old 05-22-2011, 08:19 PM
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desktop dyno help

hi im new to the site an was wondering if someone could do the desktop thing for me to see where i stand i am looking to build a 355 sbc 15.1 brodix 18x degree heads flow numbers intake 200--145--300--214--400--261 --500--303 --600--328--650--331--700--336--ex 200-119--158--196--232--243--650--247--700--250 crower 5.7 rods 4340 crower crank camshaft is a solid roller--259--266--597--600 timing numbers are--18--50--60--12-- 110 lobe sep ---lsa 106--icl 102 not sure what size carb any help would be great thanks chris

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Last edited by CHEVY760; 05-22-2011 at 08:24 PM.
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Old 05-22-2011, 10:11 PM
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forgot the valve size 2.140--1.600
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Old 05-23-2011, 08:03 AM
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What rpm are you spinning it to and what fuel are you gonna be running?

Last edited by zildjian4life218; 05-23-2011 at 08:08 AM.
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Old 05-23-2011, 08:23 AM
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heres a screen shot of a dyno sim
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Old 05-23-2011, 08:39 AM
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Quote:
Originally Posted by zildjian4life218
heres a screen shot of a dyno sim

thats cool a little less then i thought but still good i see that you used different timing for the cam then what i posted did the numbers you came up with make more power the gas is methanol about 7000rpm if you dont mine would you do a 406 using the same combo an 6in rods thanks chris
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Old 05-23-2011, 08:46 AM
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Quote:
Originally Posted by CHEVY760
hi im new to the site an was wondering if someone could do the desktop thing for me to see where i stand i am looking to build a 355 sbc 15.1 brodix 18x degree heads flow numbers intake 200--145--300--214--400--261 --500--303 --600--328--650--331--700--336--ex 200-119--158--196--232--243--650--247--700--250 crower 5.7 rods 4340 crower crank camshaft is a solid roller--259--266--597--600 timing numbers are--18--50--60--12-- 110 lobe sep ---lsa 106--icl 102 not sure what size carb any help would be great thanks chris
If you want an accurate estimate, techinspector1 has said the following is needed:

Quote:
Originally Posted by techinspector1
DYNOSIM REQUIRED DATA....
Bore
Stroke
Rod Length
Cylinder head flow, intake and exhaust 0.100" through 0.700" or whatever the mfg gives for range
Intake valve diameter
Exhaust valve diameter
Static compression ratio
CFM, type of induction (2-bbl, 4-bbl, TBI, TPI)
Intake manifold type, mfg (single 4-bbl, two 4-bbl, one 2-bbl, three 2-bbl, individual runner Weber, mechanical fuel injection, low-rise, high-rise, tunnel ram, dual-plane, single-plane, part no. if you have it.
Exhaust system (be specific, primary tube size if long-tube headers)
I have quite a library of Comp Cams (give me part number, not grind number) in my files, but if you are using another mfg, I'll need type (flat, roller, solid, hyd.), intake valve lift, exhaust valve lift and the following timing info and at what tappet lift the info is valid...(0.006", 0.050") I can calculate from 0.020" if I'm given enough information, but again, that takes my time.
Intake opens ______BTDC
Intake closes ______ABDC
Exhaust opens______BBDC
Exhaust closes______ATDC
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Old 05-23-2011, 09:02 AM
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Cobalt is right. To get a more accurate measurement there is a better program out there and tech has it... this is just a ball park figure. The 406 will def better meet your goals and make a little more power lower in the rpm band....this dynosim also has methanol as the favored fuel where the other one had gas...
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Old 05-23-2011, 09:02 AM
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Quote:
Originally Posted by cobalt327
If you want an accurate estimate, techinspector1 has said the following is needed:
355 ci 4.030 bore stroke 3.48 15.1 compression methanol gas heads sts18spx cnc ported 2.140--1.600---flow numbers 200--145--300--214--300--261--500--303--600--328--650--331--700-336--ex200--119--300--158--400--196--500--232--600--243--650--247--700--250 intake hv1800--5.7 rods camshaft is a solid roller 259--266--597--600 lift timing numbers 18-50--60--12 110 lobe sep--lsa 106--icl 102 carb 950 long tube headers--would like to see what a 406 would do with this same comdo if you dont mine bore 4.155x3.75 stroke 6in rods thanks chris
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Old 05-23-2011, 09:20 AM
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Quote:
Originally Posted by CHEVY760
355 ci 4.030 bore stroke 3.48 15.1 compression methanol gas heads sts18spx cnc ported 2.140--1.600---flow numbers 200--145--300--214--300--261--500--303--600--328--650--331--700-336--ex200--119--300--158--400--196--500--232--600--243--650--247--700--250 intake hv1800--5.7 rods camshaft is a solid roller 259--266--597--600 lift timing numbers 18-50--60--12 110 lobe sep--lsa 106--icl 102 carb 950 long tube headers--would like to see what a 406 would do with this same comdo if you dont mine bore 4.155x3.75 stroke 6in rods thanks chris

forgot to say the cam timing numbers are at o.50
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Old 05-23-2011, 12:27 PM
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Quote:
Originally Posted by CHEVY760
355 ci 4.030 bore stroke 3.48 15.1 compression methanol gas heads sts18spx cnc ported 2.140--1.600---flow numbers 200--145--300--214--300--261--500--303--600--328--650--331--700-336--ex200--119--300--158--400--196--500--232--600--243--650--247--700--250 intake hv1800--5.7 rods camshaft is a solid roller 259--266--597--600 lift timing numbers 18-50--60--12 110 lobe sep--lsa 106--icl 102 carb 950 long tube headers--would like to see what a 406 would do with this same comdo if you dont mine bore 4.155x3.75 stroke 6in rods thanks chris
What is the primary header diameter?

Are the intake/exhaust opening and closing points @ 0.050"?

And do you think you could have phoned it in any sloppier?

Bore- 4.030
Stroke- 3.48
Rod Length- 5.7
Intake valve diameter- 2.14”
Exhaust valve diameter- 1.6”
Static compression ratio- 15:1
CFM- 950
Type of induction- 4-bbl carb
Intake manifold type- Single plane high rise
Mfg- Brodix HV1800 single 4-bbl
Exhaust system (be specific, primary tube size if long-tube headers)- ??

CAM
Solid roller:
Intake opens __18____BTDC
Intake closes __50____ABDC
Exhaust opens__60____BBDC
Exhaust closes__12____ATDC
Lift- 0.597 int exh. 0.600
259/266 duration @ 0.050”
LSA- 106
Intake c/l 102
‘110 lobe sep’

HEADS
‘STS’ 18SPX CNC ported
Cylinder head flow-
INT
.200- 145
.300- 214
.400- 261
.500- 303
.600- 328
.650- 331
.700- 336

EXH
.200- 119
.300- 158
.400- 196
.500- 232
.600- 243
.650- 247
.700- 250

Would like to see what a 406 would do with this same combo if you don’t mind. Bore 4.155” x 3.75” stroke, 6 in. rods.
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Old 05-23-2011, 12:59 PM
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Quote:
Originally Posted by cobalt327
Are the intake/exhaust opening and closing points @ 0.050"?
Disregard.
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Old 05-23-2011, 02:12 PM
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Quote:
Originally Posted by cobalt327
What is the primary header diameter?

Are the intake/exhaust opening and closing points @ 0.050"?

And do you think you could have phoned it in any sloppier?

Bore- 4.030
Stroke- 3.48
Rod Length- 5.7
Intake valve diameter- 2.14”
Exhaust valve diameter- 1.6”
Static compression ratio- 15:1
CFM- 950
Type of induction- 4-bbl carb
Intake manifold type- Single plane high rise
Mfg- Brodix HV1800 single 4-bbl
Exhaust system (be specific, primary tube size if long-tube headers)- ??

CAM
Solid roller:
Intake opens __18____BTDC
Intake closes __50____ABDC
Exhaust opens__60____BBDC
Exhaust closes__12____ATDC
Lift- 0.597 int exh. 0.600
259/266 duration @ 0.050”
LSA- 106
Intake c/l 102
‘110 lobe sep’

HEADS
‘STS’ 18SPX CNC ported
Cylinder head flow-
INT
.200- 145
.300- 214
.400- 261
.500- 303
.600- 328
.650- 331
.700- 336

EXH
.200- 119
.300- 158
.400- 196
.500- 232
.600- 243
.650- 247
.700- 250

Would like to see what a 406 would do with this same combo if you don’t mind. Bore 4.155” x 3.75” stroke, 6 in. rods.
sorry ill try again


355 ci
15.1 compression--methanol gas
4.030 bore
3.48 stroke
solid roller camshaft duration @.050 in259--ex266
in lift 597--ex lift 600
valve timing @o.50 in 18-50--ex 60-12
lobe sep 110
lsa 106
icl 102
heads sts18spx cnc ported
valve size 2.140in--1.600 ex
flow numbers
intake
.200--145
.300--214
.400--261
.500--303
.600--328
.650--331
.700--336
exhaust
.200--119
.300--158
.400--196
.500--232
.600--243
.650--247
.700--250
intake hv1800
5.7 rods
4340 crank
2in primaries--3 1/2 collector long tube headers
950 carb
7000 max rpm

if you dont mine i would like a 406 done also

406ci
3.75 stroke
4.155 bore
6in rods
solid roller camshaft duration @.50 intake 268--exhaust276
lsa/icl 106/102---110 lobe sep
intake lift 606 exhaust lift 606
timing@0.50--intake--32-56--exhaust --68-28
15.1 compression methanol gas
sts 18 spx cnc ported
valve size
2.140 intake
1.600 exhaust
flow numbers
intake
.200--145
.300--214
.400--261
.500--303
.600--328
.650--331
.700--336
exhaust
.200--119
.300--158
.400--196
.500--232
.600--243
.650--247
.700--250
1050 carb
intake hv 1800
2in primaries --3 1/2 collector long tube headers
max rpm 7000

would like to thank everyone for their time --chris
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Old 05-23-2011, 02:23 PM
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Killer! Different cam this time in the 406, I see. I'm curious what the sim would say the peak HP RPM is going to be on the 355 cid engine? I'm thinking it'll want all of the 7000 RPM you are giving it as a max RPM. Prolly the 406 as well, given the longer timing of the cam you have for it this time.

If you have the cams' brands and part numbers, that might help.
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Old 05-23-2011, 05:33 PM
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Quote:
Originally Posted by cobalt327
Killer! Different cam this time in the 406, I see. I'm curious what the sim would say the peak HP RPM is going to be on the 355 cid engine? I'm thinking it'll want all of the 7000 RPM you are giving it as a max RPM. Prolly the 406 as well, given the longer timing of the cam you have for it this time.

If you have the cams' brands and part numbers, that might help.

the one for the 355 is a lunati part#50169
the one for the 406 is a lunati part#50174
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Old 05-25-2011, 09:54 AM
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JUST WONDERING WHO IS GOING TO DO THE DYNO THING WOULD LIKE TO SEE WHAT THE CAMS ARE GOING TO DO CANT WAIT TO SEE EM
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