lq4 combo for track
02-10-2011, 11:04 AM
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lq4 combo for track hey fellas,
I just bought a nice coupe that I'm building into a 1/4 mi bracket car (foot brake). I would like to hear your opinion or advice on this setup.
The powerplant will consist of a stock lq4 shortblock, 243's milled .040, port work done by a local hand porter, stock valves, and valve job. I calculated the CR to be 11.35 with a .040 thick gasket.
Induction: Victor Jr intake and a 850 4150 style carb.
Ignition: MSD-6010
Headers: 1 7/8" dynatech
Trans: th350 with an 8" converter 5000?
Rear: 4.10's with 26 or 28" tall tire
Now what I'm having trouble deciding on is a cam. I want to be able to run on pump (93oct) gas and I don't want to shift any higher than 7k. I was thinking somewhere with duration in the 240's and a lsa of 110.
Any help would be greatly appreciated.
Lance
Here are some details and pics of the car...
Stock style suspension coupe with aje k
member for SBC, BBC or LS
- aje k member and hustler a-arms
- strange front brakes
- strange struts with coil overs
- nice 8 point cage
- sub frame connectors
- strange adjustable rear shocks
- aerospace rear brakes
- bulletproof 8.8 moser spool
- moser axles narrowed 2 inches per side
- megabit control arms
- braided fuel line with Holley pump
- Holley regulator for NOS
- line lock all new wired, not plumbed
- Autometer guages mounted in dash pods
- Weld wheels 15x10 and 15x3.5
- Front tires are brand new
- Rear tires are Hoosier 26x8.5" - 3 passes
- nice full stock interior including backseat
- bolt / pin 4" hood
- electric fan
- on/off switch in rear
- driveshaft loop
- wheelie bar tabs on rear
I just bought a nice coupe that I'm building into a 1/4 mi bracket car (foot brake). I would like to hear your opinion or advice on this setup.
The powerplant will consist of a stock lq4 shortblock, 243's milled .040, port work done by a local hand porter, stock valves, and valve job. I calculated the CR to be 11.35 with a .040 thick gasket.
Induction: Victor Jr intake and a 850 4150 style carb.
Ignition: MSD-6010
Headers: 1 7/8" dynatech
Trans: th350 with an 8" converter 5000?
Rear: 4.10's with 26 or 28" tall tire
Now what I'm having trouble deciding on is a cam. I want to be able to run on pump (93oct) gas and I don't want to shift any higher than 7k. I was thinking somewhere with duration in the 240's and a lsa of 110.
Any help would be greatly appreciated.
Lance
Here are some details and pics of the car...
Stock style suspension coupe with aje k
member for SBC, BBC or LS
- aje k member and hustler a-arms
- strange front brakes
- strange struts with coil overs
- nice 8 point cage
- sub frame connectors
- strange adjustable rear shocks
- aerospace rear brakes
- bulletproof 8.8 moser spool
- moser axles narrowed 2 inches per side
- megabit control arms
- braided fuel line with Holley pump
- Holley regulator for NOS
- line lock all new wired, not plumbed
- Autometer guages mounted in dash pods
- Weld wheels 15x10 and 15x3.5
- Front tires are brand new
- Rear tires are Hoosier 26x8.5" - 3 passes
- nice full stock interior including backseat
- bolt / pin 4" hood
- electric fan
- on/off switch in rear
- driveshaft loop
- wheelie bar tabs on rear
02-10-2011, 11:42 AM
#2
Give Pat G a PM, otherwise, that sounds like Trex territory, that is what i have and i run 7.2 with a 1.6 60 before getting kicked dues to no fire suit, i was going for a 7.1 with a 1.5 60. That is in a 89 camaro, should be 3100-3200 before my 300 pounds gets in, stock 317s milled .030.
So, with your combo, it would be a way faster setup with that cam. It is on a 110 LSA as well.
The company that makes the cam went 11.48 i think with a stock long block with that cam in a 4th gen.
242/248 @.050, .610/.615 lift on a 110, i shift at 7000.
So, with your combo, it would be a way faster setup with that cam. It is on a 110 LSA as well.
The company that makes the cam went 11.48 i think with a stock long block with that cam in a 4th gen.
242/248 @.050, .610/.615 lift on a 110, i shift at 7000.
02-10-2011, 01:43 PM
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Zones,
I had figured something along the lines of a TRex from what I have gathered but I'm no cam expert by any means.
I just played with the DCR calculator using TRex specs on XER lobes, assuming it has a 106 ICL (+4 advance), I came up with 8.5. That being said It will allow the cam to bleed off more cylinder pressure enable to run pump gas. I know more than likely I'm going to have to flycut the pistons for a cam of this size.
Am I on the right track?
Lance
I had figured something along the lines of a TRex from what I have gathered but I'm no cam expert by any means.
I just played with the DCR calculator using TRex specs on XER lobes, assuming it has a 106 ICL (+4 advance), I came up with 8.5. That being said It will allow the cam to bleed off more cylinder pressure enable to run pump gas. I know more than likely I'm going to have to flycut the pistons for a cam of this size.
Am I on the right track?
Lance
02-10-2011, 07:56 PM
#7
That's with the trex. I have used the cam many times and highly reccomend it. It will be very aggressive throughout the band and wot. And almost psycho with spray. 
Most likely will need to cut in vr in pistons, especially with the .040 thick gaskets. Quench will be around .030. Usually lq4 are around .010 out the bore TDC. Excellent selection of parts.
Most likely will need to cut in vr in pistons, especially with the .040 thick gaskets. Quench will be around .030. Usually lq4 are around .010 out the bore TDC. Excellent selection of parts.
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02-11-2011, 04:24 PM
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I been old school small block racing for years just started fooling with fuel inj 7 years ago. I know few guys doing 12 to 1 fuel inj .personaly never seen anyone have any luck with 11 to 1 with carb on 93 but that was with distribitor .timing curve with msd ls box could make it much easier to make a 93 Oct curve
02-11-2011, 04:30 PM
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I been old school small block racing for years just started fooling with fuel inj 7 years ago. I know few guys doing 12 to 1 fuel inj .personaly never seen anyone have any luck with 11 to 1 with carb on 93 but that was with distribitor .timing curve with msd ls box could make it much easier to make a 93 Oct curve
By the way mine is 11.6 to1 it will run on pump gas but if i am spraying a big kit i use good fuel. Last edited by six.o; 02-11-2011 at 04:36 PM.
02-11-2011, 05:13 PM
#13
Billy, i have had some dispute with a friend, what does your car weigh with and without you in it?
Old school small blocks were not near as efficient as the LS engine, the pistons sat down in the bore on TDC, the LS is out of the bore, the chambers are way more efficient and if you tried 11 to 1 with a old small block and iron heads, chances are it can run fine, but like a dog because the timing would have to be pulled back. Now, with aluminum heads on the old SBC, 11 is possible as again, with a tune.
I been old school small block racing for years just started fooling with fuel inj 7 years ago. I know few guys doing 12 to 1 fuel inj .personaly never seen anyone have any luck with 11 to 1 with carb on 93 but that was with distribitor .timing curve with msd ls box could make it much easier to make a 93 Oct curve
02-11-2011, 08:31 PM
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I appreciate the feed back y'all!
I've been following Billy's setup and it just flat out works. Hopefully mine can be just as good. What would be a good operating range for this setup? Since I want this engine to live, I guess it would be best for me to install some good rod bolts in it.
To flycut the pistons I guess I would take it to a machine shop since I don't have all the tools to degree the cam and check ptv.
Lastly, have y'all had any experience with EPS's single plane cam?
it's 236/248 @ .050 .615/.615 with 108 LSA
Thanks,
Lance
I've been following Billy's setup and it just flat out works. Hopefully mine can be just as good. What would be a good operating range for this setup? Since I want this engine to live, I guess it would be best for me to install some good rod bolts in it.
To flycut the pistons I guess I would take it to a machine shop since I don't have all the tools to degree the cam and check ptv.
Lastly, have y'all had any experience with EPS's single plane cam?
it's 236/248 @ .050 .615/.615 with 108 LSA
Thanks,
Lance
02-11-2011, 08:35 PM
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Billy, i have had some dispute with a friend, what does your car weigh with and without you in it?
Old school small blocks were not near as efficient as the LS engine, the pistons sat down in the bore on TDC, the LS is out of the bore, the chambers are way more efficient and if you tried 11 to 1 with a old small block and iron heads, chances are it can run fine, but like a dog because the timing would have to be pulled back. Now, with aluminum heads on the old SBC, 11 is possible as again, with a tune.
Old school small blocks were not near as efficient as the LS engine, the pistons sat down in the bore on TDC, the LS is out of the bore, the chambers are way more efficient and if you tried 11 to 1 with a old small block and iron heads, chances are it can run fine, but like a dog because the timing would have to be pulled back. Now, with aluminum heads on the old SBC, 11 is possible as again, with a tune.
02-12-2011, 12:28 AM
#16
I appreciate the feed back y'all!
I've been following Billy's setup and it just flat out works. Hopefully mine can be just as good. What would be a good operating range for this setup? Since I want this engine to live, I guess it would be best for me to install some good rod bolts in it.
To flycut the pistons I guess I would take it to a machine shop since I don't have all the tools to degree the cam and check ptv.
Lastly, have y'all had any experience with EPS's single plane cam?
it's 236/248 @ .050 .615/.615 with 108 LSA
Thanks,
Lance
I've been following Billy's setup and it just flat out works. Hopefully mine can be just as good. What would be a good operating range for this setup? Since I want this engine to live, I guess it would be best for me to install some good rod bolts in it.
To flycut the pistons I guess I would take it to a machine shop since I don't have all the tools to degree the cam and check ptv.
Lastly, have y'all had any experience with EPS's single plane cam?
it's 236/248 @ .050 .615/.615 with 108 LSA
Thanks,
Lance
I am hitting 7200 with a stock long block, so ARP or kateck bolts would be good insurance.
Pretty light, no videos still?
02-12-2011, 11:45 AM
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Billy, i have had some dispute with a friend, what does your car weigh with and without you in it?
Old school small blocks were not near as efficient as the LS engine, the pistons sat down in the bore on TDC, the LS is out of the bore, the chambers are way more efficient and if you tried 11 to 1 with a old small block and iron heads, chances are it can run fine, but like a dog because the timing would have to be pulled back. Now, with aluminum heads on the old SBC, 11 is possible as again, with a tune.
Old school small blocks were not near as efficient as the LS engine, the pistons sat down in the bore on TDC, the LS is out of the bore, the chambers are way more efficient and if you tried 11 to 1 with a old small block and iron heads, chances are it can run fine, but like a dog because the timing would have to be pulled back. Now, with aluminum heads on the old SBC, 11 is possible as again, with a tune.