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Topic Review (Newest First)
11-18-2012 08:37 AM
F-BIRD'88 The tires are 275/60/15 MT DRs

Ya I got that, now measure the true loaded radius, on the car, on the ground and re-calc.
(They are effectively shorter then 28")

They are the 200cc & i'm sure there the platinums, good stuff,now just got to get them to do what they should
be doing. Once thing I found critical wiht thee heads and the Sportsman II's the manifold must be port matched to the
head.

SlowMaster mufflers.... you know what to do there.

look at the fuel system too.

engine compression test. valve springs gone away.
11-18-2012 12:48 AM
LJM97Z They are the 200cc & i'm sure there the platinums, I'm really leaning towards the XE284H or 285HL, I've ran that cam in 2 different engines & it really worked great, tuning was easy also.

When i calculated the converter, It ran a 105 that night, so it came out to 12% with a 28" tire, The tires are 275/60/15 MT DRs. When it ran 108 it came up 10%, I'm hoping i'm not running through the converter.

When i 1st. put the car together i was running a stock converter with the little cam, Tires were 255/60/15s (27"), In the beginning the car pulled really strong in high gear.

The mufflers are slow masters.
11-17-2012 06:13 AM
F-BIRD'88 Another solid that works good in 406's with converter and gears.
Use either intake manifold. Comp cams # 12-502-5 CS 280TL-6 likes to rev.
Hot lash .018-.020" when you cold lash it cold lash at .014-.016
degree it in. 106 LSA 100-to-102 in C/L locked out timing.
rough idle oval/bracket race. more serious street strip.
The heads have to work for this cam to work.
Your car is working like you have entry level S/R heads. (heads , fuel system)
The nice thing about Dart heads is there is lots of meat for porting.
If they turn out to be the 180cc port Dart heads they will need serious serious work.
11-17-2012 05:50 AM
F-BIRD'88 IMHO you do not need a new intake or carb, or 1-3/4 headers . what you are doing with the little cam is not too bad.

But to get to 11's you will need more power. and there is something killing the top end by at least 2.5 MPH.

I had a 130GPH mech pump yet that turned out to be my problem. switched to a 72GPH rated electric (7psi), big diffeence. no more top end fuel starvation.
I would look at the fuel system, exhaust system and cylinder heads for power.
what is the part number stamped on the front of your dart heads?
Again if non platinum series, they need work.
If you want a cam, the COmp XE284H-10 cam does work well. The crane solid will work better.
Why did you take the 4.10's out? re converter slippage %: recalc using the true effective loaded rolling radius of the MT tires. (measure from the ground to the axle C/L) you will find the tires are shorter than 28".
when I estimate your loaded tire radius I get 7% slipage 5900 rpm 108MPH 27" effect diameter.

If flowmaster mufflers they always cost performance. Sometimes a lot of perf. You'd be amazed.
uncap with collector extensions and test.
The converter efficietrnce improves the further away from the stall speed you get (RPM), thru the traps.
Your trap rpm should be 6600+ rpm. You need to get your 60ft down 1.60 sec.

The weight seems pretty light. I'd rescale it. Everybody is repuatable until they get caught.
Because based on 3200#'s and 108 MPH you are making 375-380hp
based on 110.5 mph (87 MPH in the 1/8th) you are making 392 HP. This should be your trap speed now, not 108.
You need to add/find 50hp (after finding the power killer) and improve the launch to get it in the 11's.
11-17-2012 12:13 AM
vinniekq2 If it was my car,I would use a vic jr intake,850 H.P.,headers would have 1 3/4 primaries(or 1 3/4 primaries stepped to 1 7/8),I would have 1/2 fuel line from tank to regulator, if it was driven long distance I would leave the gears you have,when you get more serious about race I would look at trans/gear combo ,,,now spend some time on suspension, alignment,pinion angle,chasis height,weight transfer(shocks and springs) unsprung weight
11-17-2012 12:09 AM
LJM97Z
Quote:
Originally Posted by idontdrivericeieatit View Post
Yea there is for sure something going wrong in this combo got friend with std bore 350 with comp 284h cam 507 and 510. Lift and crappy 882 heads ported and polished eddy performer rpm with 750dp carb with 373 gear in pickup thats 4000 pounds and hes running 92 mph in 1/8 you should be smokin him with what you have
This doesn't surprise me lol.
11-17-2012 12:00 AM
idontdrivericeieatit Yea there is for sure something going wrong in this combo got friend with std bore 350 with comp 284h cam 507 and 510. Lift and crappy 882 heads ported and polished eddy performer rpm with 750dp carb with 373 gear in pickup thats 4000 pounds and hes running 92 mph in 1/8 you should be smokin him with what you have
11-16-2012 11:40 PM
LJM97Z
Quote:
Originally Posted by vinniekq2 View Post
when you get the correct answer,please post it here. I see 1 5/8 headers and manifold/carb/fuel delivery as all needing upgrades.( what I found the best upgrades in my 67 Camaro when I was stuck at 12.20) I think there is a lot more in the car somewhere???
What intake/carb would you recommend? What about the headers/exhaust?
11-16-2012 11:16 PM
vinniekq2 when you get the correct answer,please post it here. I see 1 5/8 headers and manifold/carb/fuel delivery as all needing upgrades.( what I found the best upgrades in my 67 Camaro when I was stuck at 12.20) I think there is a lot more in the car somewhere???
11-16-2012 09:40 PM
LJM97Z
Quote:
Originally Posted by vinniekq2 View Post
intake/carb if the fuel "volume" is ok
I don't see the intake makeing much difference, & the carb was changed & it likes the 750dp, I'm not going to stat throwing more money at it changes things, I've been told by many the RPM intake is more then fine.

I think there is a problem & i just can't pin point it.
11-16-2012 08:40 PM
vinniekq2 intake/carb if the fuel "volume" is ok
11-16-2012 08:34 PM
LJM97Z It WAS trapping around 5900 with the 4.11s & a 28" MT DR, I did have the car weighed on a reputable scale at the local rock cuarry plant, I wasn't too surprized of its weight, Its a bare bones cutlass, not the fancy ones, I'm only 145 lbs., so i'm a light weight, It would be nice if the car was heavier, it would explain its slower times, Now i did calculate converter slippage & it was saying 12%, that seems a bit high, I'm getting somewhat at my wits ends with this combo, Its like what the heck, I know it should run better but it doesn't, It feels like it just runs out of steam in high gear, it just doesn't pull, but on other accasions it seems better, maybe its fuel, but i'm running a 110 pump with 8 lbs. pressure, the fuel line is all good, so is the tank.
11-16-2012 04:13 PM
F-BIRD'88 Right now you are not trapping with near enough rpm, even for the small 224deg cam ( gear ratio.)
I bet you are barely above 5200rpm thru the traps.
what is the tire diameter? measured effective diameter from the ground to the center of the axle.
You need to get the car to launch much harder (gears, tires rear suspension, converter and get the MPH way up (horsepower/weight ratio) 115 ish MPH for 11sec et's. 6000-6300 rpm shifts, 6600+ rpm trap rpm.
11-16-2012 03:41 PM
F-BIRD'88 If your cutlass does weight 3200w driver and only does 108 in the 1/4 mile that engine is wounded (way down on power)
or the transmisson/converter is wounded or you are starving it for fuel.
just from your data I can see the car is nosing over between the 1/8th and 1/4 mile.
And its not from too much gear . thats for sure.
You are ruunning down the whole track on the converter

weight the car. You are going to need a very very short tire to make a 3.70 gear work.
On a Regal we did, we used a 23" drag radial with 3.73's P225-50-15. That car could have used even more gear and converter.
350CID, big solid that loved rpm.

Right now you are not trapping with near enough rpm, even for the small 224deg cam ( gear ratio.)
I bet you are barely above 5200rpm thru the traps.
what is the tire diameter? measured effective diameter from the ground to the center of the axle.
11-16-2012 03:25 PM
F-BIRD'88 87 in the 18th and 108 in the 1/4 you are loosing 2.5 MPH in the last half of the run.
You car should be MPHing right at 110.5 MPH, as it is now.

What is the 1/8th et and 1/4 et from the same slips. (a few samples)

Nitrous and the converter stall: you re much better off with the 4200stall, (unless its wounded, needs servicing) especially with nitrous.

There may be other cars that are running 11's with a 3.70 gear but they are makeing a lot more horsepower and the car is likely lighter than your car is.

start by weighting your car, on a accurate scale, with you in it.

Are your heads the newer, revised port Platinum series 200cc heads? They are not the same as the conventional older Iron Eagle head.
Stock, modified, flow test?

you need to get your MPH way way up. (horsepower)

What was going on ith the car that the big cam didn;t work? Besides "it was hard to tune"
couple sample ET slips from that.

Nitrous is just the icing on the cake. You want to get the car to run like it should , on the motor.
Cutlass 's weight more than 3200 # with driver. The plain jane Malibu "Iraq-y- taxi is light. The Cutlass and Regal, not so much.
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