i wasn't sure which one to post in, so i picked this one. yes, we need to see the dyno sheet. there are several problems at first sight.
347 Stroker Combo
I need your input. I just finished up the stroker motor and on the dyno after 6 pulls, it only made 318rwhp. Of course i was hoping for alot better hp numbers than that. Speed shop blames camshaft for the lack of power and also my max power was being made at only 5100 rpm and then it would drop off considerably. Let me know what you think.
Thanks in advance
Here is my combo. . . . . .
347 Eagle Stroker bored .30 Fully Forged 3.400
Patriot Performance 185cc heads 2.02/1.6
Z 303 Camshaft
1.6 Scorpion Roller Rockers
Trick Flow Track Heat Intake w/ 1/2" heat spacer
75mm Throttle Body with BBK cold air intake
Full MSD ignition w/ ultra 40 plug wires
42 lb fuel injectors
A9L computer with Chip and custom tune
7 quart oil pan with windage tray and girdle
BBK Long tube headers, H-Pipe and Flowmasters w/ dumps
Tremec TKO 500 - Center Force Clutch
4.10 Rear Gear
275/50 MT Drag Radials
(Also car is going to be setup with a 200 shot of nos)
I'm just wondering why my combo is only make power to 5100 rpms and only 318rwhp, I was really hoping for aleast 360+rwhp?
Is the Z303 cam really not that good?
Thanks in advance
Here is my combo. . . . . .
347 Eagle Stroker bored .30 Fully Forged 3.400
Patriot Performance 185cc heads 2.02/1.6
Z 303 Camshaft
1.6 Scorpion Roller Rockers
Trick Flow Track Heat Intake w/ 1/2" heat spacer
75mm Throttle Body with BBK cold air intake
Full MSD ignition w/ ultra 40 plug wires
42 lb fuel injectors
A9L computer with Chip and custom tune
7 quart oil pan with windage tray and girdle
BBK Long tube headers, H-Pipe and Flowmasters w/ dumps
Tremec TKO 500 - Center Force Clutch
4.10 Rear Gear
275/50 MT Drag Radials
(Also car is going to be setup with a 200 shot of nos)
I'm just wondering why my combo is only make power to 5100 rpms and only 318rwhp, I was really hoping for aleast 360+rwhp?
Is the Z303 cam really not that good?
1 - 15 of 15 Posts
Don't have dyno sheet with me but it made some where around 360/370 ft lb of torque.
The line for hp power was real smooth across the board, started really climbing from 3,000 and hits 5200 rpm and falls on its face after that.
The line for hp power was real smooth across the board, started really climbing from 3,000 and hits 5200 rpm and falls on its face after that.
I'm wondering if I retard my cam sprocket, if that would give me (if any) a little more top end rpm to at least 5800 rpm. Right now I have it set at TDC. Any ideas?
Personally I would swap out the cam.Having one custom ground is ideal but for a good "off the shelf cam" I would go with the Comp XE 282 HR (same one i run) or one of there stroker cams.My 347 pulls clean to 6400.I would upgrade your valve springs as they are already maxed out with the z cam your running.The listing for your heads says good to .550 lift.Did you notice valve float on the dyno?Did you check the pushrod length? What did you set valve lash at? What MAF are you running?I saw a "200 shot of Nitrous is coming".I wouldn't spray that much on a built 347.A cracked block will be soon to follow.I won't spray over 100 shot on mine as I don't have the cash for a good block yet. Just my .02 cents worth.
Yeah on friday i filled out comp cam's custom cam sheet to see what cam they can grind for me, Also my heads were upgraded to .600 spring max lift and no there was no floating valves on the dyno. We measured the pushrod and everything is correct fit, the rockers are set at zero lash with about a quarter turn, and i'm using a 76mm C & L mass air meter. Actually I was talking to somebody else and they reccomeded the same cam you did. I just don't know why, i'm only making power to 5100 rpms????????
^ That's where I'd start.I would upgrade your valve springs as they are already maxed out with the z cam your running.
Here's your problem list:I'm just wondering why my combo is only make power to 5100 rpms and only 318rwhp
Patriot Performance 185cc heads 2.02/1.6
Z 303 Camshaft
Trick Flow Track Heat Intake w/ 1/2" heat spacer
If you want to make some meaningful power (like 400+rwhp) I suggest you go for the following:
TEA ported TFS 205cc heads
CompCams XE274HR-12 cam or custom
TFS R intake
Well before i do anything i'll see what comp cam's has to say and I'm really hoping if i can switch out to a custom grind cam maybe i can get closer to reaching my hp goal. Of course the goal was 400+rwhp, but if i can get 375rwhp with this combo, i'll be happy.
the FIRST thing you need to do is figure out why it is laying down at 5100! i'm with pete on this, valve springs. just because you put different springs in that does not automaticly make it good to go. :nono:
only problem with going to TFS heads now is he would either have to replace to pistons or possibly fly cut the pistons.Here's your problem list:
Patriot Performance 185cc heads 2.02/1.6
Z 303 Camshaft
Trick Flow Track Heat Intake w/ 1/2" heat spacer
If you want to make some meaningful power (like 400+rwhp) I suggest you go for the following:
TEA ported TFS 205cc heads
CompCams XE274HR-12 cam or custom
TFS R intake
i had a similar setup on my 347 build. Same intake (no spacer), TFS 190cc heads and a Custom grind from Ed curtis. Last tune i had before i sold it it put down 376rwhp/409rwtq on a wet and muggy day. With that setup i was seeing power drop off after 5500 rpm (both the tuner and i thought it was a little early) but i sold the car before i looked into why. So at 318rwhp you definitely have power left on the table. A custom grind cam would be a good start for your combo.
Like the others said you need to find out why mechanically it is falling short.
Secondly the combo of parts are lacking as they are a mismatch of parts.
Secondly the combo of parts are lacking as they are a mismatch of parts.
Here is what comp cams recommened:
"After reviewing your cam spec sheet, I think that you are way undercammed. I would go with camshaft part number 35-775-8. Duration @ .050 236/248 Lift is .579/.579 with a 114 LSA. This should help the horse power as well as the RPM. The cost of the kit is $297.78 and I will cover shipping to the lower 48 states. - Gabriel, Technical Consultant Comp Performance Group"
I think i'm going to go ahead and order this cam and see what happens.
"After reviewing your cam spec sheet, I think that you are way undercammed. I would go with camshaft part number 35-775-8. Duration @ .050 236/248 Lift is .579/.579 with a 114 LSA. This should help the horse power as well as the RPM. The cost of the kit is $297.78 and I will cover shipping to the lower 48 states. - Gabriel, Technical Consultant Comp Performance Group"
I think i'm going to go ahead and order this cam and see what happens.
i think thats exactly what you should do.....:kooky:
More going on there and don't expect a cam swap to fix your problems.
1 - 15 of 15 Posts
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