opinions on this shortblock
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
opinions on this shortblock
Last fall, I purchased a vortech supercharger kit and im trying to get everything together to install the kit. I ran into a problem with my motor starting to develop blow by, and have been considering rebuild or replace. Labor rates is this area are so high and I was leaning towards using the comp. supercharger short block in this link. http://www.golenengineservice.com/ht...rt_blocks.html
My heads, I purchased used, but they were supposed to be hand ported by TEA several years ago. Here is the flow numbers that were given to me.
.100 60 55
.200 125 111
.300 187 155
.400 230 187
.500 263 207
.550 258 211
.600 253 215
I had new guides and seats installed, cleaned up, pressure tested, etc. about 7,000 miles ago.
I would like to reuse the heads and the above shortblock. I currently have a hotcam which I have been told is not a good choice for a blower motor. I am open for suggestions on a cam choice as well, and keep in mind, I have to pass emissions inspections.
All of my other mods are in my signature. Again, any advise or suggestions will be appreciated.
Edit to say, I currently have 3.73 gears and a 52mm TB
My heads, I purchased used, but they were supposed to be hand ported by TEA several years ago. Here is the flow numbers that were given to me.
.100 60 55
.200 125 111
.300 187 155
.400 230 187
.500 263 207
.550 258 211
.600 253 215
I had new guides and seats installed, cleaned up, pressure tested, etc. about 7,000 miles ago.
I would like to reuse the heads and the above shortblock. I currently have a hotcam which I have been told is not a good choice for a blower motor. I am open for suggestions on a cam choice as well, and keep in mind, I have to pass emissions inspections.
All of my other mods are in my signature. Again, any advise or suggestions will be appreciated.
Edit to say, I currently have 3.73 gears and a 52mm TB
Melting Slicks
Joined: Sep 2000
Posts: 3,150
Likes: 1
From: Carlsbad, CA CA
I think this is a better package and will save you a few dollars. http://www.dyno-flo.com/ds-pro-line-383.html
I'm running their 377 with upgraded main caps, rod bolts, JE pistons.
I'm running their 377 with upgraded main caps, rod bolts, JE pistons.
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
The biggest thing about a supercharged motor is that it needs to be a low compression motor. If you are running stock ported heads then you need to make sure the pistons are dished pretty well. I had to get some custom pistons for my setup.
For those heads make sure you keep the max lift to the 500-550 range. The hotcam won't be the greatest for power, however if you are worried about emissions then it would be a good bet. When you increase the displacement it will seem like a smaller cam.
How much boost are you planning on running with this new setup? Remember its not worth building a 30+psi engine if your pulley setup can only support 15.
For those heads make sure you keep the max lift to the 500-550 range. The hotcam won't be the greatest for power, however if you are worried about emissions then it would be a good bet. When you increase the displacement it will seem like a smaller cam.
How much boost are you planning on running with this new setup? Remember its not worth building a 30+psi engine if your pulley setup can only support 15.
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
The pistons are supposed to be -34 cc. and using their online calculator, I came up with a compression ratio of 9 - 9.3 to 1 depending on gaskets.
The heads, I wanted to keep what I have for now, mainly because of money.
But would consider changing at a later date. The main thing is, I dont want to do the block but once.
The cam choice is fairly cheap when weighing labor to switch again, so I dont mind changing it at this time. I already have the hotcam, but I have been told they do not work well with boost. I just dont know.
The supercharger is a vortech kit, I purchased used in the fall. The head unit (S-Trim) was recently rebuilt and has very few miles on it. However it is a stock kit. I have been told to expect about 6 psi.
But I do want to be able to add additional boost at a future date.
The heads, I wanted to keep what I have for now, mainly because of money.
But would consider changing at a later date. The main thing is, I dont want to do the block but once. The cam choice is fairly cheap when weighing labor to switch again, so I dont mind changing it at this time. I already have the hotcam, but I have been told they do not work well with boost. I just dont know.
The supercharger is a vortech kit, I purchased used in the fall. The head unit (S-Trim) was recently rebuilt and has very few miles on it. However it is a stock kit. I have been told to expect about 6 psi.
But I do want to be able to add additional boost at a future date.
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
The hotcam will work. It will work fine. You will not make as much horsepower as if you went with a huge duration cam though. A weekend worth of work and you can swap to a new cam if you want to. I would suggest going to a larger pulley setup before you bother upgrading the cam if you are worried about emissions though.
9:1 will limit you to 12-15psi or so without any problems. But you will need to switch to an 8-rib or cog setup to get that I believe.
I understand about only doing the bottom end once. It didn't work for me but I tried. It sounds like you are on the right track and should not have any problems.
Just for a little comparison here's what I'm running.
Forged 383ci 9:1 compression
ported stock heads max flow 250 or so
turbo with single 3.5" exhaust
cam is a 224/218 which is bigger than yours but probably won't pass emissions. For a decent SC setup I would suggest a 224/230 but that would be if you lived by me with no emissions.
I manged to trap a 127mph @8psi or so. My time was an 11.5 but I couldn't launch(1.98 60') on my old street tires and the tires always broke loose on my 1-2 shift. I also ran the boost at 12 psi but didn't see a time improvement and only a slight mph improvement. I've been told I need stiffer valve springs.
9:1 will limit you to 12-15psi or so without any problems. But you will need to switch to an 8-rib or cog setup to get that I believe.
I understand about only doing the bottom end once. It didn't work for me but I tried. It sounds like you are on the right track and should not have any problems.
Just for a little comparison here's what I'm running.
Forged 383ci 9:1 compression
ported stock heads max flow 250 or so
turbo with single 3.5" exhaust
cam is a 224/218 which is bigger than yours but probably won't pass emissions. For a decent SC setup I would suggest a 224/230 but that would be if you lived by me with no emissions.
I manged to trap a 127mph @8psi or so. My time was an 11.5 but I couldn't launch(1.98 60') on my old street tires and the tires always broke loose on my 1-2 shift. I also ran the boost at 12 psi but didn't see a time improvement and only a slight mph improvement. I've been told I need stiffer valve springs.
Melting Slicks
Joined: Jun 1999
Posts: 2,872
Likes: 3
From: Wilmington NC
well said Brian!
I agree with all of the above.. but I also think you can grab yourelf a shortblock a bit cheaper then what they sell for. try these folks and you might be able to save 500 bucks or add the new cam and get a electric waterpump and have them upgrade you to a double roller timing set for less!
revolutionary performance machine
other then that sounds like ya have a decent idea for a solid foundation!
Chris
I agree with all of the above.. but I also think you can grab yourelf a shortblock a bit cheaper then what they sell for. try these folks and you might be able to save 500 bucks or add the new cam and get a electric waterpump and have them upgrade you to a double roller timing set for less!
revolutionary performance machine
other then that sounds like ya have a decent idea for a solid foundation!
Chris
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
Chris, that link shows they use pistons with a -28 cc dish. This would raise the compression to 9.7 vs 9.2 with the -34 cc dish that Golen uses. Also, they use a 6 in rod vs a 5.7 in rod. I have been told to try and stay with a 5.7 due to the piston pin being moved up so high in the piston (ring area) and was told this is not good on a blower motor.
Brian, Again, this could be just a myth, but I was told that the hotcam would not work well with a blower. If I remember correctly it was due to the 112 seperation. I was told it will not build boost as well as a 114 or so seperation cam. By the way the specs. are 218-228 and 525-525.
As far as the electric waterpump and double roller timing set goes, I already have that. But I am concerned about clearance with the electric pump and the supercharger tube going from the supercharger to the throttle body. If it clears it will be close.
I really appreciate your input on this project and look forward to hearing more. This is a learning process for me, and Im trying not to make to many mistakes.
Edit to add. The Golen motor has been o-ringed. Is this worth while to have done?
Brian, Again, this could be just a myth, but I was told that the hotcam would not work well with a blower. If I remember correctly it was due to the 112 seperation. I was told it will not build boost as well as a 114 or so seperation cam. By the way the specs. are 218-228 and 525-525.
As far as the electric waterpump and double roller timing set goes, I already have that. But I am concerned about clearance with the electric pump and the supercharger tube going from the supercharger to the throttle body. If it clears it will be close.
I really appreciate your input on this project and look forward to hearing more. This is a learning process for me, and Im trying not to make to many mistakes.
Edit to add. The Golen motor has been o-ringed. Is this worth while to have done?
Last edited by 93 ragtop; Jan 31, 2007 at 10:15 AM.
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