Installing a Thumpr cam from Comp Cams

Reply Subscribe

Thread Tools

Search this Thread

11-05-2007, 02:33 PM

89transam*pearl

Member

Thread Starter

iTrader: (1)

Join Date: Jun 2007

Location: Halifax, N.S.

Posts: 318

Likes: 0

Received 0 Likes on 0 Posts

Car: 89 T/A

Engine: LB9

Transmission: W/C T-5

Axle/Gears: 10 bolt posi, 3.73 Richmond Gears

Installing a Thumpr cam from Comp Cams

I thinking about installing a Thumpr cam from Comp Cams in my 89 T/A - 305 HO and wondering if anyone can shed some light (what extra is needed or is it something that can be installed in a small block (305) without changing anything else??
Thanks

Reply Like

11-05-2007, 02:47 PM

five7kid

Moderator

iTrader: (14)

Join Date: Mar 2000

Location: Littleton, CO USA

Posts: 43,169

Likes: 0

Received 35 Likes on 34 Posts

Car: 82 Berlinetta/57 Bel Air

Engine: LS1/LQ4

Transmission: 4L60E/4L80E

Axle/Gears: 12B-3.73/9"-3.89

Too much duration and not enough LSA to be computer friendly. Too much lift for stock heads.

Not a good idea.

Reply Like

11-05-2007, 02:54 PM

89transam*pearl

Member

Thread Starter

iTrader: (1)

Join Date: Jun 2007

Location: Halifax, N.S.

Posts: 318

Likes: 0

Received 0 Likes on 0 Posts

Car: 89 T/A

Engine: LB9

Transmission: W/C T-5

Axle/Gears: 10 bolt posi, 3.73 Richmond Gears

Re: Installing a Thumpr cam from Comp Cams

Thanks five7kid any suggestions....I liked the sound bite on the Comp Cam web site that the Thumbr and MuthaThumpr cams made...

Reply Like

11-05-2007, 04:42 PM

Sonix

Supreme Member

iTrader: (1)

Join Date: Jul 2004

Location: Calgary, AB, Canada

Posts: 10,763

Likes: 0

Received 4 Likes on 4 Posts

Car: 1982 Trans-Am

Engine: 355 w/ ported 416s

Transmission: T10, hurst shifter

Axle/Gears: 10 bolt, true-trac, 3.73

Re: Installing a Thumpr cam from Comp Cams

Wouldn't you rather have more power than more sound? Mufflers can get you nicer sound, the cam should be picked based on power!
The compxe258hr is a solid performer in the 305 TPI engine. Tried and true, a good replacement for your peanut cam.

Reply Like

11-05-2007, 05:33 PM

rhuarc31

Member

Join Date: Mar 2003

Location: Central Illiniois

Posts: 282

Likes: 0

Received 0 Likes on 0 Posts

Car: 89 Formula 350

Engine: 409 nitrous' small block

Transmission: 700r4

Re: Installing a Thumpr cam from Comp Cams

Agree, if you want a good sound, exhaust is a much better way to do it, hard to beat the sound of a flowmaster

Reply Like

11-06-2007, 02:19 AM

InfernalVortex

Supreme Member

iTrader: (4)

Join Date: Dec 2005

Location: Macon, GA

Posts: 6,485

Likes: 1

Received 20 Likes on 17 Posts

Car: 1992 Camaro RS

Engine: Vortec headed 355, xe262

Transmission: T56

Axle/Gears: 9-bolt 3.70

Re: Installing a Thumpr cam from Comp Cams

Quote:

Originally Posted by 89transam*pearl

Thanks five7kid any suggestions....I liked the sound bite on the Comp Cam web site that the Thumbr and MuthaThumpr cams made...

You do realize that they purposely designed the cam to not idle well to get that sound, right? The sound is arguably the only redeeming feature of that cam. It's not meant to perform well. It's meant to sound the way it does. That's its only purpose. A poor idle just means the engine can barely sustain its own momentum at low RPMs. ie, you dont have much low RPM power. Unfortuantely, the way that cam is designed, you dont have all that much high RPM power either.

You'd be better off getting a cam that's actually meant to work well or a cam that's actually meant to give you tons of power, instead of sacrificing both for sound.

If you want a showcar, buy that cam and do what you need to make it work (heads, valvetrain, tuning), if you want a cam that's actually designed to work well, following Sonix' advice isnt a bad idea.