Discussion in 'High Tech for Old Iron' started by sailbrd, Sep 24, 2010.
on the hood one.................
on the hood two......................
Cannot swear to what size vacuum line I use for the boost reference. Same size that would go to the vac can for the heater/AC controls. Seems to work fine. Braided line erases all doubts about the line though.
I need help from those of you that are using centrifugal superchargers.
I'd like to know what you are using for timing for boost levels up to 10 lbs.
I realize there are many variables such as compression ratio, type of head,
intercoolers, fuel octane, carb, EFI, ect..
If you don't mind including your combination or any other pertinent information it would help.
Thanks in advance for the education
What kind of ignation system do you have?
Some systems have a "plug and play" type of timing control.
I have my Mallory system set to 24 * total advance. It does fine with the aluminum heads.
some other varibles.....
octane rating in the fuel used
type of driving
spark plug gap (as I just found out )
In this particular case the car is not mine. I'm just helping out.
However I'd like to know more for future projects.
Will be using an MSD 7531 with a 2 bar map sensor.
There is also a water to air intercooler.
It will be mainly drag racing.
What's the gap info? What type of plugs do you use?
In the middle of a cam change right now. Finally putting in the Scott Brown custom.
Here are the specs. 462, 9.5:1, Poston girdled pan, Iron stage 1's mild porting, 4" front mount intercooler, 650 Quickfuel BAN carb. D1 Procharger. 5to 7 pounds of boost. I run a Mallory distributor, 6al box with MSD boost contoller. Timing is 22* initial, 10* centrifical with no vacuum advance. The disadvatage of the MSD boost controller is that it is really a guess as to how much timing is being pulled our. My guess is that it likes about 24*to 26* total advance at 5 psi. WOT afr is about 11.4. Still sorting it out. (like that will ever end :laugh: )
Thanks Doug for your feedback.
We use our leak down tester to check all our Racepak pressure sensors and any other pressure device.
Make up a set of fittings so you can attach your leak down tester to the manifold line that goes to the MSD boost control unit.
Don't forget to plug the fitting in the intake manifold after the line is removed.
With the regulator on the leak down tester turned completely off start the engine and adjust the rpm so all the mechanic advance is in.
Then slowly apply pressure to the MSD boost control unit with the leak down tester till you get to 5 lbs and check the timing with a timing light.
Let me know if this works for you.
What a great idea! thanks
What's a leak down tester.. I'm in the same boat.. I just assume it works. I haven't found anyone willing to lay under the hood while I nail ito No:
A cylinder leak down tester fills the cylinder with air through the spark plug hole and indicates what percentage of air is leaking out of the cylinder.
Unlike a compression tester you can figure out where the air is going, rings, intake valve, exhaust valve or bubbles in the radiator coolant for a bad head gasket.
Since it has an air regulator and gauges it can be used for testing many other devices.
Every shop should have one!
I hope this helps.
I have to ask this in hope of someone answering it. Has anyone try and run a belt drive for the cam instead of a chain? I do know you have to drive the oil pump and distributor but that would be for the folks running individual coils and dry sumps. I'm interested in seeing this set up. I talk alot about a person that does turbo engines on here but I want mention his name ok. I am doing a 550 Tomahawk block which will be all roller, including roller cam bearings and custom made heads and intake, I plan on running twin 72 mm turbo's to possible 92 mm turbo's depending on what my turbo guy says. It will be going in a 10.5w 1970 GS Stage 1 Skylark.ray: Please tell me what you think please.
Pics to fallow
1965 Skylark, 12 bolt posi, 4.11 gears, billet aluminum adjustable 4 link
Adjustable rebound/compression coilovers.
Chromoly tubular front control arms with adjustable coilovers and 4 piston discs on all four corners.
72' Buick 350
Ported heads with larger stainless steel valves
My MPFI intake with a 90mm LS throttle body
MS3X with coil packs and sequential injection, GN cam sensor......
Block bored .040 for cleanup
custom forged and coated diamond pistons, 8.95-1 compression
Modified forged SBC Carrillo sprint cup car rods, a little bit longed than the stock buicks
Custom ground isky cam
Carbon nitrided crank
My adjustable stainless steel roller rockers
My turbo manifolds with two 52mm turbos, dual waist gates and BOV
T56 six speed manual with upgraded internals, hydraulic clutch, hopefully it will hold up....
Front mounted Air to air intercooler and methanol injection
More to come, slow moving project but should make for a REALLY fun car!
It's not forced induction but also in the works, 1937 fenderless chevy bobber with a 4 speed and 56' 322 nailhead with a six pot carb setup and old isky cam.....
I have been reading through this thread with much interest. I am starting to get the "Itch" to try some form of boost, but having zero experience in this area, I'm seeking counsel before doing something silly.
I'm wondering if those of you who have "gone before" would care to comment (Pro or Con) on the current supercharger kits being offered by TA Performance? Good buy for the money? A reasonable bolt-on project for a moderately experienced shade-tree mechanic? My '70 Skylark still has the original 350ci engine (9.0 comp. ratio, factory 285 HP, engine code=SB), with about 90,000 miles and running perfectly. I have added a TA Stage 1 intake with a Holly 4-Bbl, and a Mallory Comp SS distributor and coil. The rest of the engine is still untouched factory stock original, except for normal external replacement service items (water pump, alternator, etc).
My goal would be a very mild level of modification - I.E low boost levels on a mostly stock (internally) pump-gas engine, requiring few compromises when used in a street-driven weekend fun car. The TA 1220H-1 kit (P-1SC supercharger + water injection, list price $5750.00) would seem to be suited to this type of project. What would be the minimum preparation required before adding this kit to my engine? Could I get away with using the stock internals? Can you still run power steering and A/C with this kit installed? I realize I can call TA and ask these questions, but I thought I would solicit some opinions here before I bother those guys. If it looks like this project would be way too expensive or complicated for my limited (financial and mental) resources, I'll just forget all about it and go back to day-dreaming.
Any and all advice/comments would be welcome. Thanks.
I would not Run much boost with stock parts.
Maybe three pounds at the most. Although with a 350, you may get away with five pounds.
Hey man , i just happened ta come across ur thumb nail pics of ur car an i bought fell over , that was my car for almost 15 years , i built the car my self an did all the work ecept paint an body work , plez call me whn u get a chance , id like to talk to ya ! my cell # 276-202-6492 my names Rick , i can answr any questns u hav about her , thanx ! !
If I was you I would run a Twin Turbo Kit from Burton Machine. You can not run AC but you can run power steering with the turbo kit. There is supposed to be a single turbo kit coming out that will allow AC. I am currently adding this kit to a stock 70 Buick 350 like the one you have. All we added was ported heads, and a single plane intake the stock cam, pistons, etc are in place. This engine will be pushed on the street, dyno and track before the good Buick 350 is swapped in. I am using some thicker head gaskets to get the compression to about 8.6:1 down from 9:1.
I see no reason why you can not boost 7 PSI to the stock engine, and if you did hurt the engine you could find another 350 that runs great for about $200 and then add some forged pistons... The only thing that really needs to be upgraded for higher boost on the Buick 350 is the pistons. At the 700+ HP range we are adding stronger connecting rods as well.
Here is Jay and his car with the twin kit using a basically stock engine:
Here is mark Burton who builds the kits, he has been boosting a worn out stock 350 for years now:
Send Mark or myself a PM if you want more info... Sean :TU:
Thanks for taking the time to post a thoughtful reply to my question. I have read all about the twin turbo setups on this forum, and they are "more" of everything than I wish to pursue. All I want is something simple, that I can bolt on my existing engine in a weekend (ha, ha), and have it quickly running on the street without needing to be a Rocket Scientist. I don't need a race car, I just want a little more power than stock, and something that will look good when I pop the hood at cruise night. That's why I asked about the TA Performance blower kit. "Kit" implies easy install without a lot of parts chasing or custom fabrication. The water injection should help it run with pump gas and my stock compression. But since nobody has responded with any specific info about the TA supercharger kit, I must assume it has not attracted a lot of buyers. I have some other projects keeping me occupied at this time, so any mods to my Skylark are pretty much on hold. Meanwhile, I'll keep reading and educating myself on the options. Thanks again, Chuck Avery.