Another 305 to 350
#1
Member
Thread Starter
Join Date: Nov 2004
Location: Los Angeles, CA
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1985 Chevrolet Camaro IROC-Z28
Engine: 305 TPI
Transmission: 700R4
Another 305 to 350
For anyone who might remember the 305, I've blown it up, and moved onto a 350.
Edelbrock 1406 carburetor, Holley Intake Manifold, stock everything else.
For the most part it is running well, I got it up to 110-120 on the freeway yesterday, and it felt like it was still accelerating.
But my problem is the initial acceleration. The 305 had great torque, and when stomped on from a dead stop, would almost "take a breath" and then just start screaming. That engine could hold it's own against a lot of cars, until they caught up, and beat it. But the launch was good.
The 350 however doesn't really accelerate quickly. It takes it's time, and really hauls *** in terms of top speed, but it doesn't launch well. It doesn't even do the "taking a breath" thing that I liked about the 305. It just starts to go when you floor it, and goes equally as fast at about 1/2 throttle, or 3/4 throttle. There isn't a difference in launch speed.
So. Do you think this is Carb related, a timing issue, trans, all of the above, or something different all together?
I appreciate any input, and thanks again for all the help.
This place made all of this possible.
-Chris
Edelbrock 1406 carburetor, Holley Intake Manifold, stock everything else.
For the most part it is running well, I got it up to 110-120 on the freeway yesterday, and it felt like it was still accelerating.
But my problem is the initial acceleration. The 305 had great torque, and when stomped on from a dead stop, would almost "take a breath" and then just start screaming. That engine could hold it's own against a lot of cars, until they caught up, and beat it. But the launch was good.
The 350 however doesn't really accelerate quickly. It takes it's time, and really hauls *** in terms of top speed, but it doesn't launch well. It doesn't even do the "taking a breath" thing that I liked about the 305. It just starts to go when you floor it, and goes equally as fast at about 1/2 throttle, or 3/4 throttle. There isn't a difference in launch speed.
So. Do you think this is Carb related, a timing issue, trans, all of the above, or something different all together?
I appreciate any input, and thanks again for all the help.
This place made all of this possible.
-Chris
#2
Supreme Member
Join Date: Jul 2001
Location: BFE, MD
Posts: 4,461
Likes: 0
Received 0 Likes
on
0 Posts
Car: 13 Ram 1500/ 78 Formy
Engine: 5.7 / 7.4
Transmission: 6sp / TH350
Axle/Gears: 3.55 posi / 3.23
you'll get better help in the carb section. the 'take a breath" is it bogging, then it catches up. the just as fast @ 1/2 & 3/4 throttle, could need som enew secondary rods, but since I haven't needed to worry about carter/edelcrotch carbs I'll say no more. Also check that your throttle plates are opening fully when the go pedal is mashed.
#3
Member
Thread Starter
Join Date: Nov 2004
Location: Los Angeles, CA
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1985 Chevrolet Camaro IROC-Z28
Engine: 305 TPI
Transmission: 700R4
Yeah, they definately open all the way, I checked that when I adjusted the TV cable, wanted to make sure it was actually reaching WOT.
But you say it sounds like the carburetor for sure?
I'll post over there too.
Thank you!
But you say it sounds like the carburetor for sure?
I'll post over there too.
Thank you!
#4
Member
Join Date: Nov 2001
Location: colorado springs, colorado, USA
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
Car: 83-84 camaro, 95 formula firehawk
Engine: 305, 305ho, 350tpi, 350 lt1, 383lt1
Transmission: 700r4, t-5, t56, m6
Axle/Gears: 3:90, 4:10, 3:50, and more
classic rochester quadra-bog
#5
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
Originally posted by chevymetal
...Edelbrock 1406 carburetor..
...Edelbrock 1406 carburetor..
Originally posted by montesa311
classic rochester quadra-bog
classic rochester quadra-bog
#6
Member
Join Date: Nov 2001
Location: colorado springs, colorado, USA
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
Car: 83-84 camaro, 95 formula firehawk
Engine: 305, 305ho, 350tpi, 350 lt1, 383lt1
Transmission: 700r4, t-5, t56, m6
Axle/Gears: 3:90, 4:10, 3:50, and more
lol, whoops missed that part... is that vac secondaires?
Trending Topics
#8
Member
Join Date: Jun 2002
Location: Sacramento,Ca.
Posts: 391
Likes: 0
Received 0 Likes
on
0 Posts
Car: 90 Formula
Engine: 355 C.I.
Transmission: 5 Speed
Axle/Gears: 3.42
I'd look at the timing. Infact bring it up ( Advance it ) till it pings and take it back a bit and see where your at.run it there and see how it performs. if it's really high you might have an advance issue or a spun balancer.
#9
Member
Thread Starter
Join Date: Nov 2004
Location: Los Angeles, CA
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1985 Chevrolet Camaro IROC-Z28
Engine: 305 TPI
Transmission: 700R4
Originally posted by 90Formula-X-F
I'd look at the timing. Infact bring it up ( Advance it ) till it pings and take it back a bit and see where your at.run it there and see how it performs. if it's really high you might have an advance issue or a spun balancer.
I'd look at the timing. Infact bring it up ( Advance it ) till it pings and take it back a bit and see where your at.run it there and see how it performs. if it's really high you might have an advance issue or a spun balancer.
By balancer are you talking about a harmonic balancer?
And pardon my ignorance, but what does "spun" mean in whatever you are referring to?
I was looking at some MSD distributors yesterday, and I'm wondering if it would be worth the cash. Right now I'm running a J-Yard distributor, and I think that may be an issue.
Probably the weakest link on the engine.
I'm definitely still learning.
Last edited by chevymetal; 08-23-2005 at 07:01 PM.
#10
Member
Join Date: Jun 2002
Location: Sacramento,Ca.
Posts: 391
Likes: 0
Received 0 Likes
on
0 Posts
Car: 90 Formula
Engine: 355 C.I.
Transmission: 5 Speed
Axle/Gears: 3.42
The balancer is basicly 2 pieces of steel with a rubber issolater ring between them. I've seem many that the outter ring turns on the rubber which misaligns the timing marks. I've seen them spin and slide back into the timing cover and wear a hole in that too.
#11
Member
Thread Starter
Join Date: Nov 2004
Location: Los Angeles, CA
Posts: 237
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1985 Chevrolet Camaro IROC-Z28
Engine: 305 TPI
Transmission: 700R4
Originally posted by 90Formula-X-F
The balancer is basicly 2 pieces of steel with a rubber issolater ring between them. I've seem many that the outter ring turns on the rubber which misaligns the timing marks. I've seen them spin and slide back into the timing cover and wear a hole in that too.
The balancer is basicly 2 pieces of steel with a rubber issolater ring between them. I've seem many that the outter ring turns on the rubber which misaligns the timing marks. I've seen them spin and slide back into the timing cover and wear a hole in that too.
#12
Member
Join Date: Jun 2002
Location: Sacramento,Ca.
Posts: 391
Likes: 0
Received 0 Likes
on
0 Posts
Car: 90 Formula
Engine: 355 C.I.
Transmission: 5 Speed
Axle/Gears: 3.42
see if it's slid backwards toward the ting cover - bring #1 to TDC and see if it's where it looks to be right
#13
Senior Member
Join Date: Feb 2004
Location: Savannah GA
Posts: 814
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1982 Trans Am
Engine: 383 chevy
Transmission: T-5
Axle/Gears: 4th gen 10-bolt, posi, 3.42 ratio
btw.... the 1406 is a mech secondaries carb. I ran one til i pulled my motor.
#14
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
Originally posted by flyitlikustolit
btw.... the 1406 is a mech secondaries carb.
btw.... the 1406 is a mech secondaries carb.
It may not be totally accurate to call Edelbrock's "vacuum secondaries", but it is even more inaccurate to call them "mechanical secondaries".
Last edited by five7kid; 08-29-2005 at 12:52 PM.
Thread
Thread Starter
Forum
Replies
Last Post