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Username Post: TBI, Looking for cam how much duration is OK        (Topic#75236)
1993GMCPU 
Senior Member
Posts: 189

Loc: USA
Reg: 01-24-04
09-11-04 02:39 PM - Post#511645    

We were looking for a new cam and notice Crane has a 210-216 .05 duration cam which seems a little weak, but with a TBI, I was told you have to be conservative. I was told High Energy 218 @ .05 duration Comp Cam was to much cam, but I thought cam got good vacuum. Any suggestions?

 
DragRacer383 
Super Senior Member
Posts: 4807
DragRacer383
Age: 6
Loc: Arkansas
Reg: 07-17-01
Re: TBI, Looking for cam how much duration is OK
09-11-04 02:58 PM - Post#511646    
    In response to 1993GMCPU

Weak? as opposed to what. BTW I have heard not to go over 206 .050 Dur. with TBI.

I have that cam in my truck (well the 266 single pattern). Mild 350. It run pretty good. It a good all around truck grind. BTW it will break off in the 13's. Runs on 87 octane also.

Here is the Truck. Notice its hooked to a trailer.


A little of its handy work. Those are only about 60' long.
Traffic was coming.

Later,Glen


 
MikeB 
Senior Member
Posts: 9479
MikeB
Loc: Plano, TX
Reg: 08-28-03
Re: TBI, Looking for cam how much duration is OK
09-11-04 05:05 PM - Post#511647    
    In response to 1993GMCPU

Assuming the engine is otherwise stock, the 210/216 cam will NOT be weak, but you may want to look for a cam specifically designed for TBI engines. Crane, Comp, Lunati, and others make them. One thing they all have in common is a wide LSA (like 112-115 to keep vacuum high. In any case, a cam with more intake duration than the one you mentioned needs a higher compression ratio than stock.

Read the manufacturer's description of their cams' RPM ranges and recommended gear ratios and then make your selection on the conservative side.
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



 
1993GMCPU 
Senior Member
Posts: 189

Loc: USA
Reg: 01-24-04
Re: TBI, Looking for cam how much duration is OK
09-12-04 04:35 AM - Post#511648    
    In response to MikeB

Compression is 9:1, HYP 40 over pistons, Pro Topline SR Heads 1.94 valved (Have set of NEW Torquer (86 Style) Pro Topline Heads need 2.02 valves,settomg under my bed!), balance, ARP rod bolts and resized rods etc. Flowing into Flow master 3"intake 2 2.5 outake muffler in front of rear tire with a high flow cat for now. Looking at Headman full headers vs shortie headers. Crane cam I mentioned was their compucam cams. I looked at Comp Cams but only a very few say for TBI mostly TPI all FI have 112-114 LSA vs say their HE 218-457 110 etc.

Cool burn out thanks for the time it took to show me that my truck may have hope, and wondered if you can tell motor has a cam? 266 seem to be a different grind as the one I looked at was not single grind. ANY chip reworking? Chip manufacture in Tulsa wants $350 local or try Howell EFI 200.

 
DCarr511 
Senior Member
Posts: 142
DCarr511
Loc: Tn.
Reg: 02-11-04
Re: TBI, Looking for cam how much duration is OK
09-12-04 08:29 AM - Post#511649    
    In response to 1993GMCPU

I have used a couple of Cranes " Energizer " cams with between 218-224 dur. @ .050 in TB engines .. 350 and 454 cid .. good running engines and no problems

 
MikeB 
Senior Member
Posts: 9479
MikeB
Loc: Plano, TX
Reg: 08-28-03
Re: TBI, Looking for cam how much duration is OK
09-12-04 08:34 AM - Post#511650    
    In response to 1993GMCPU

Quote:

Crane cam I mentioned was their compucam cams.



Are you talking about Crane's 2040 flat tappet cam? If you don't have a 3.73 or numerically higher axle, I think their 2030 (204/214) would be your best bet. The 2030 will be fine with 2.73 - 3.43.

You might ask Crane for their advice on a cam and any other changes, such as computer mods or more fuel pressure.
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



 
DragRacer383 
Super Senior Member
Posts: 4807
DragRacer383
Age: 6
Loc: Arkansas
Reg: 07-17-01
Re: TBI, Looking for cam how much duration is OK
09-13-04 01:37 AM - Post#511651    
    In response to 1993GMCPU

I'm sorry the specs you listed matched the "266 Power max" I have the "266 energizer".
My engine is pretty much what you described in yours. Only I have a 350th,2,000 stall,3.73 gears, and a carb.


Its got a rumble at idle.

Later,Glen


 
MikeB 
Senior Member
Posts: 9479
MikeB
Loc: Plano, TX
Reg: 08-28-03
Re: TBI, Looking for cam how much duration is OK
09-13-04 03:57 AM - Post#511652    
    In response to DragRacer383

Drag Racer 383 -- So, how fast is the dog?
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



 
DragRacer383 
Super Senior Member
Posts: 4807
DragRacer383
Age: 6
Loc: Arkansas
Reg: 07-17-01
Re: TBI, Looking for cam how much duration is OK
09-13-04 11:01 AM - Post#511653    
    In response to MikeB

LOL , Its my Work Truck, so don't laugh.. I did run it through the 1/8 It pulled down a 8.95 all motor. In theory that should break into the 13's.

I put a 50 shot of Nitrous on it and got it in the mid 8's.
It's up to a 100 shot now., but It probably won't see any track time this year. Busy working on the Camaro's. I'm trying to build a 3'rd gen that will run 7.0 and I can drive to the Track (if I want to )

I did Bring home the money 3 times with it in the 9.0 class.
She ain't fast but its consistent.
Later,Glen


 
MikeB 
Senior Member
Posts: 9479
MikeB
Loc: Plano, TX
Reg: 08-28-03
Re: TBI, Looking for cam how much duration is OK
09-13-04 11:14 AM - Post#511654    
    In response to DragRacer383

No, I meant the dog with the rocket pack!
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



 
Big_Paul 
Old as Dirt Member
Posts: 7306
Big_Paul
Age: 29
Loc: Turlock, California
Reg: 09-24-01
Re: TBI, Looking for cam how much duration is OK
09-13-04 11:14 AM - Post#511655    
    In response to DragRacer383

Casper's Electronics makes a MAP sensor deal that allows you run a wilder cam on TBI engines.
'96 C-1500 305
'00 Monte Carlo SS
'02 Silverado 2500 HD
------------------------


 
DragRacer383 
Super Senior Member
Posts: 4807
DragRacer383
Age: 6
Loc: Arkansas
Reg: 07-17-01
Re: TBI, Looking for cam how much duration is OK
09-13-04 01:32 PM - Post#511656    
    In response to DragRacer383

LOL. Yeah I guess I forgot about that.


I would say It would take a turpentined Cat to get away.
Thats Poor Boy Racing there.
Later,Glen


 
1993GMCPU 
Senior Member
Posts: 189

Loc: USA
Reg: 01-24-04
Re: TBI, Looking for cam how much duration is OK
09-14-04 08:56 AM - Post#511657    
    In response to DragRacer383

I wrote Casper Elec and waiting for a response. Lunati has a 211-217 @ .05 duration 441/453 lift cam for TBI 350 as well, but it would be cool to be able to run a 218-224 if I want to as most performance cams, in past, that I ran were in this range with over 450 lift and 1.6 rockers would be cool. Lunati cam has a 110 LSA compared to small cam I had in truck with 114 running 212-218 duration with 444 lift, ran ok but it was not what I wanted and sounded stock except for Flowmaster Mufflers, SM Block Chevy's have always wanted to wine and first time with small block I want a cam that will do what's needed when needed, 3.42 gears for now, 3.73 later.

Later, we hope to go to a 400 Crank and stroke motor depending on funds which made my son's Impala motor a torque monster. I was told to stay with 112-114 LSA which I am assuming is to keep up vacuum, but Lunati TBI cam is suppose to run well with 110 LSA. When I change out cam, I plan later and selling SR heads. I will use their 86 style Pro Topline Torkers heads and searching web for 2.02 stainless valves. Smaller chamber heads as heads I have now were their stock SR 76 cc v.s. bare their 68 cc heads, 76 cc were shaved .020 and went to a .015 head gasket for better quench. I am going to use 68 cc heads and same .015 gasket which may bump compression a little more. Will try to find Ebay seller in Oregon of chevy valves if he's still around as he had a good buy and hope this helps HP some. Piston Fed Mogul H345NP40 2 valve relieves.

 
1993GMCPU 
Senior Member
Posts: 189

Loc: USA
Reg: 01-24-04
Re: TBI, Looking for cam how much duration is OK
09-14-04 02:11 PM - Post#511658    
    In response to 1993GMCPU

Never used a Summit cam such as this, has anyone used this:

SUM-1103

Image is a representation of this part. Actual part may vary.
Application Guide
Tip

Select Make AMERICAN MOTORS CHEVROLET CHRYSLER DODGE FORD PLYMOUTH PONTIAC

Cams that have you covered.
Camshaft, Hydraulic Flat Tappet, Advertised Duration 272/282, Lift .442/.465, Chevy Small Block, Ea.

From low-end torque to top-end horsepower--and everything in between--one of our Summit cams has you covered. Assembly lube is included.

Vendor Summit
Product Line Summit Camshafts
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 2,000-4,500 RPM
Intake Duration 050 inch Lift 214
Exhaust Duration 050 inch Lift 224
Advertised Intake Duration 272
Advertised Exhaust Duration 282
Intake Valve Lift with Factory Rocker Arm Ratio 0.442
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.465
Lobe Separation (degrees) 112
Intake Valve Lash (in) 0.000
Exhaust Valve Lash (in) 0.000
Grind Number (Not Specified)
CARB EO Number (Not Specified)
Quantity Sold individually.
Notes (Not Specified)


 
LB9_IROCZ28 
Member
Posts: 5

Loc: Dallas TX
Reg: 04-06-05
Re: TBI, Looking for cam how much duration is OK
04-06-05 02:55 PM - Post#511659    
    In response to 1993GMCPU

Hey guys, I'm a newbie here (my first post.) I've been reading quite a bit about the heads on these TBI engines. Over at thirdgen.org (third generation camaro/firebird forum) there is much discussion about such engines, more specifically the L03 (TBI 305.) I think the 350 TBI is called the L05 if I'm not mistaken. The 305 and 350 TBI's have different heads, but the posts are relevant to both. Anyway, I wanted to bring up this site because there is some good talk about cams for these engines.

Also, the heads on these engines can be made to flow! Like 220+ cfm intake, and only 20 cfm less on exhaust, all the way up to around .500 lift. Since these engines are getting older, anyone interested in a cam swap may want to think about doing a quickie rebuild, cam swap, and some head porting. According to some thirdgen.org posts, the L05 can put out 330+ fhp and 375+ ftq. Check it out.

I haven't searched here for this topic (yet), but does anyone know of bolt on turbo kits for TPI 3rd gens?

Thanks. Josh

FYI -- I have the Summit "TPI" cam in my car. Its 204/214 @ 0.050, .420/.442 etc... I lost a LOT of low end grunt, but gained a ton of mid hp. The loss of low end could be overcame with the right torque converter -- I noticed it so much because my trans is jacked up. It stalls (brake torquing) at 1200 rpm (too freakin low) and the converter automatically locks up as soon as it shifts into 2nd, even with the tcc unplugged (internal issues.)
86 IROC-Z 305 TPI cammed, exhaust, chip, ram-air, T-Tops, 700R4 not for much longer (currently collecting parts for T5 swap) long term: turbo kit, rollcage, 'glass hood, bigger binders


 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
Re: TBI, Looking for cam how much duration is OK
04-06-05 04:14 PM - Post#511660    
    In response to LB9_IROCZ28

If you have the roller cam provisions you can add the roller lifters, lifter link bars, spyder, and retainer on the front. I am running a LT1 roller cam along with some "193" swirl ports that were abused by my dremel. This engine flat scoots. I ran a 1/8 in 10.32 @ 70 with a 2.55s 60' with a near stock TBI setup on top (6* advanced timing and 17 psi fuel pressure) and just cleaning up the VE tables in the ECM some. I have since returned and run a 9.86 @ 76 with a 2.18s 60' time. This is in a full size van with a 700r4 and 3.08 gears along with P255/70/R15 tires.

I have a post on Thirdgen.org about porting 193s.
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
65_Impala 
Very Senior Member
Posts: 2406

Reg: 12-29-02
Re: TBI, Looking for cam how much duration is OK
04-07-05 04:50 PM - Post#511661    
    In response to 1983G20Van

I have a cam that's 218/228 degree duration @ 0.050" and 0.454"/0.480" lift. Engine ran just fine. As just mentioned, A GM roller cam set-up would be ideal. Think about a Hot cam kit and a set of roller lifters. Gets you every valvetrain piece but the pushrods for about $700 US I'd expect. That rolle cam would pull much better than a flat tappet cam. If you shop on ebay you can find the LT1 cams and other parts very cheap. I don't know if I'd trust used lifters but the roller cams are very re-usable.

I'd want to keep the lobe seperation above 112 degrees but other than that there's really no restriction on the cam in a TBI engine. Just keep the total engine package in mind and know that you'll have to tune it if you deviate from stock too much.

Peter

 
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