frustration!!!
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frustration!!!
ok so i have a sbc vortec crate motor i bought rated at 330hp 380tq, i ran it like that for a while, ran great but wanted some more power. i put 4.11s and posi, built 700r4 with 2500 stall, 750 demon carb, had the heads milled a little, put different valve springs and full roller rockers with screw in studs. Then i changed the cam.DUN DUN DUN. its a lunati hydraulic roller, specs are:
.525/.540 lift 300/310 duration 110/106 lsa
Then it ran like shitttt....it would idle in park at about 1500 rpms and in gear it would try and die unless u kept ur foot on the gas. Also driving it had hardly any power low and mid range and would just bog down if full throttle. and then be ok after that but not fast. i messed with timing and the carb so much and finally gave it up. The only thing i can think that dont match up correctly are the intake and heads which are only 170cc. i almost have the money for new heads and intake. i would just like to know if that sounds like it will for sure fix the problem.
thanks for any input
-andy
.525/.540 lift 300/310 duration 110/106 lsa
Then it ran like shitttt....it would idle in park at about 1500 rpms and in gear it would try and die unless u kept ur foot on the gas. Also driving it had hardly any power low and mid range and would just bog down if full throttle. and then be ok after that but not fast. i messed with timing and the carb so much and finally gave it up. The only thing i can think that dont match up correctly are the intake and heads which are only 170cc. i almost have the money for new heads and intake. i would just like to know if that sounds like it will for sure fix the problem.
thanks for any input
-andy
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ok so i have a sbc vortec crate motor i bought rated at 330hp 380tq, i ran it like that for a while, ran great but wanted some more power. i put 4.11s and posi, built 700r4 with 2500 stall, 750 demon carb, had the heads milled a little, put different valve springs and full roller rockers with screw in studs. Then i changed the cam.DUN DUN DUN. its a lunati hydraulic roller, specs are:
.525/.540 lift 300/310 duration 110/106 lsa
Then it ran like shitttt....it would idle in park at about 1500 rpms and in gear it would try and die unless u kept ur foot on the gas. Also driving it had hardly any power low and mid range and would just bog down if full throttle. and then be ok after that but not fast. i messed with timing and the carb so much and finally gave it up. The only thing i can think that dont match up correctly are the intake and heads which are only 170cc. i almost have the money for new heads and intake. i would just like to know if that sounds like it will for sure fix the problem.
thanks for any input
-andy
.525/.540 lift 300/310 duration 110/106 lsa
Then it ran like shitttt....it would idle in park at about 1500 rpms and in gear it would try and die unless u kept ur foot on the gas. Also driving it had hardly any power low and mid range and would just bog down if full throttle. and then be ok after that but not fast. i messed with timing and the carb so much and finally gave it up. The only thing i can think that dont match up correctly are the intake and heads which are only 170cc. i almost have the money for new heads and intake. i would just like to know if that sounds like it will for sure fix the problem.
thanks for any input
-andy
What bothers me the most about that combo is the fact that the Vortec heads CAN NOT take more than .480" lift without either a spring change to the conical LSx style spring or a standard spring with machining of the valve guides for retainer to guide clearance. You never stated weather or not you swapped the springs. If you didn't change the springs I'm going to bet that you bent all of the pushrods which could very well cause the problems your describing. Very well could be (and probably is) your idle problem as well.
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Well i have drilled holes in the throttle blades and have valve springs to handle the lift, i was told the CR is 9.5 to 1 or a little more, thats y i didnt know what else to do, so i figured id get new heads like 195cc or 200cc and an air gap intake that are both rated up to 6500 rpm i think(which ill proly rarely get up to). Then id have a cam, heads and intake that are all in the same rmp range. Does that sound right??...also the gears match up, and i do agree a bigger stall would be good. Also on ryans engine combo page there are alot of really similar setups to mine, with damn near same cam but with the bigger heads and intake, and they all make over 400hp....and they all have around the same compression ratio
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Well i have drilled holes in the throttle blades and have valve springs to handle the lift, i was told the CR is 9.5 to 1 or a little more, thats y i didnt know what else to do, so i figured id get new heads like 195cc or 200cc and an air gap intake that are both rated up to 6500 rpm i think(which ill proly rarely get up to). Then id have a cam, heads and intake that are all in the same rmp range. Does that sound right??...also the gears match up, and i do agree a bigger stall would be good. Also on ryans engine combo page there are alot of really similar setups to mine, with damn near same cam but with the bigger heads and intake, and they all make over 400hp....and they all have around the same compression ratio
Last edited by fast01; 06-06-2009 at 03:05 PM.
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yes i do have 1.5 rockers and i did buy it turn key with the proper intake, but yes i know what u mean lol...however i think ive just decided to go ahead and get new heads and intake like i decided, but also get a diff cam...i wana go with the comp cams xe 288 hyraulic roller...what do u think about that setup?..it saids needs only 9.1 CR and i deff have that, and also alota lt1's on youtube have that cam with stock heads and intakes and it works fine......btw i appreciate your help thanks
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yes i do have 1.5 rockers and i did buy it turn key with the proper intake, but yes i know what u mean lol...however i think ive just decided to go ahead and get new heads and intake like i decided, but also get a diff cam...i wana go with the comp cams xe 288 hyraulic roller...what do u think about that setup?..it saids needs only 9.1 CR and i deff have that, and also alota lt1's on youtube have that cam with stock heads and intakes and it works fine......btw i appreciate your help thanks
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awesome and yes i do have the money for new heads, and intake, for sure want to help the power dept. out lol....so with a good set of heads and say the air gap intake with that cam wuta u say 430-450ish?.....and yes ive already disassembled and the push rods are straight
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awesome and yes i do have the money for new heads, and intake, for sure want to help the power dept. out lol....so with a good set of heads and say the air gap intake with that cam wuta u say 430-450ish?.....and yes ive already disassembled and the push rods are straight
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Depending on the heads, I think that's reasonable, leaning towards the lower end of the range. If you're going with an aluminum head, I'd go with a smaller chamber to raise the compression while you're at it. Given the heat dissipation properties of aluminum, you can raise the compression by 1 full point safely (9:1 to 10:1). I think that'll put you right in the 450-460 range.
ya i was planing on aluminum but wow i didnt realize it would raise the CR a entire point....thats sweettt....i really cant wait to get it running with all the new stuff!
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Just to be clear, you will need, depending on the volume of your valve reliefs, a 59cc combustion chamber as opposed to the 64cc's of the Vortecs, to achieve the 1 point bump in compression. This will require the new heads to be milled. I can't think of any that have that size chamber out of the box. Fortunately, most manufacturers will perform this operation for a fee at the time you place the order. Just tell them what you want. FWIW, I based the 59cc number on a 4.00" bore, .039" thick gasket (Fel Pro 1010), pistons .025" in the hole and 7cc valve reliefs. This is not an optimum combination because the quench is too loose, but you get the idea.
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cool i didnt realize they could do that for you from the manufacture, i was looking into the jegs heads 197/64cc but i now came across the trick flow 195s i believe and 62cc, so it wouldnt take much to get the heads to 59cc if i got the trick flows, which itd proly be better to spend the extra $200 on them i suppose.....but ya, around 450hp is exactly where i wanted to be so thats great, thanks for all ur help again
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Any time, glad I could help!
Just one more thing to consider. I'm assuming you're planning on the Trick Flow Street/Strip 23* head. The max lift on the springs on those heads is
.540" (you're at the absolute limit) and if they are anything like the AFR's I have on my 388, they won't have enough pressure to control the valve with your hydraulic roller cam. You should really consider their Super 23* Street/Strip head package. They use a .600" spring and I would imagine, should have enough seat and open pressure to control the valvetrain. Isn't this stuff fun!
Just one more thing to consider. I'm assuming you're planning on the Trick Flow Street/Strip 23* head. The max lift on the springs on those heads is
.540" (you're at the absolute limit) and if they are anything like the AFR's I have on my 388, they won't have enough pressure to control the valve with your hydraulic roller cam. You should really consider their Super 23* Street/Strip head package. They use a .600" spring and I would imagine, should have enough seat and open pressure to control the valvetrain. Isn't this stuff fun!
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im running this cam and love it. revs really fast. my heads still have stock valves and just bigger springs. and i use a 1.6 rocker
http://www.trickflow.com/partdetail....1&autoview=sku
heres a little video i took before i put exhaust on it.
http://s195.photobucket.com/albums/z...utlassidle.flv
http://www.trickflow.com/partdetail....1&autoview=sku
heres a little video i took before i put exhaust on it.
http://s195.photobucket.com/albums/z...utlassidle.flv
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what Fast01 said.
sorry but your combo is way..... jacked up.
i have a 327 "331" vortec headed with 20 milled,valve guides cleared for the 282 cam turbo 400 and 4.56s and run 7.60s in the 1/8th all day "bracket racing"
just a combo to take a look at.
vortec heads are real good, but easy bro you can over kill them too.
good luck
sorry but your combo is way..... jacked up.
i have a 327 "331" vortec headed with 20 milled,valve guides cleared for the 282 cam turbo 400 and 4.56s and run 7.60s in the 1/8th all day "bracket racing"
just a combo to take a look at.
vortec heads are real good, but easy bro you can over kill them too.
good luck
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im running this cam and love it. revs really fast. my heads still have stock valves and just bigger springs. and i use a 1.6 rocker
http://www.trickflow.com/partdetail....1&autoview=sku
heres a little video i took before i put exhaust on it.
http://s195.photobucket.com/albums/z...utlassidle.flv
http://www.trickflow.com/partdetail....1&autoview=sku
heres a little video i took before i put exhaust on it.
http://s195.photobucket.com/albums/z...utlassidle.flv
sweet man...does it sound good at idle?