QUESTIONS : TFS 1 cam and 1.7 rockers

fiveoho

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Apr 28, 2005

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Jun 28, 2006

#1

• Jun 28, 2006

• #1

original plan was 306 ( see sig ) with AFR 185s and TFS 2 cam. if i stick to the 306 idea, i may go to the TFS 1. apparently the TFS 2 is too big.

if i use the TFS 1 with 1.7 rockers, will that increase the duration and lift? if so, how much? increase power? essentially making it a bigger cam? more lope?

or does the 1.7s "tone it down" ? making the the duration/lift less?

next question: is the 1.7s physically bigger than 1.6s? if so, will the 1.7s clear stock height valve covers??


thanks guys

 

88Stang331

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Mar 30, 2006

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#2

• Jun 28, 2006

• #2

the equation to get the lift for 1.7 rockers vice 1.6 is as follows

advertised lift / 1.6 x 1.7 = New lift w/1.7 rockers

so if my lift was 564 with 1.6 rockers, i would divide 564 by 1.6 which is 352 and then multiply it by 1.7 which equates to 599

 

R

R2D2

Jun 28, 2006

#3

• Jun 28, 2006

• #3

http://sbftech.com/index.php/topic,32.0.html

the 1.7 is the same size as the 1.6

 

donsbad68

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Jun 28, 2006

#4

• Jun 28, 2006

• #4

More lift, wont affect lope, more low end power then stage 2 will offer

 

J

jjd975

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Jun 28, 2006

#5

• Jun 28, 2006

• #5

So AFR 185s with a street heat intake and a TFS 1 cam? Kinda odd combo. I dont see the needed for the AFR 185s on that car.

 

donsbad68

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#6

• Jun 28, 2006

• #6

i concur the heads are too large

 

Grn92LX

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Jun 28, 2006

#7

• Jun 28, 2006

• #7

Its not that the stg 2 cam is "too big" b/c thats far from it. Its that its wrong for the application.

Go custom to really make those heads work good. Though a street heat intake will restrict them from working as good as they can.

Those Heads are perfect for a 306.

 

R

R2D2

Jun 28, 2006

#8

• Jun 28, 2006

• #8

I see nothing wrong with the head choice, there are some other things that dont add up though

 

fiveoho

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#9

• Jun 28, 2006

• #9

88Stang331 said:

the equation to get the lift for 1.7 rockers vice 1.6 is as follows

advertised lift / 1.6 x 1.7 = New lift w/1.7 rockers

so if my lift was 564 with 1.6 rockers, i would divide 564 by 1.6 which is 352 and then multiply it by 1.7 which equates to 599

Click to expand...

preciate the help 88Stang331

 

88Stang331

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#10

• Jun 28, 2006

• #10

No problem, remember to take that into account when taking into consideration Piston/Valve clearance.

 

aleborjas

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Jun 28, 2006

#11

• Jun 28, 2006

• #11

the TFS 1 lift with 1.6 is INT.499 EX .510 and the same cam with 1.7 the lift goes up to INT .530 EX .541 the iddle is going to be the same but maybe you get a little more RPM's and physically they look the same!

 

88Stang331

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#12

• Jun 28, 2006

• #12

aleborjas said:

the TFS 1 lift with 1.6 is INT.499 EX .510 and the same cam with 1.7 the lift goes up to INT .530 EX .541 the iddle is going to be the same but maybe you get a little more RPM's and physically they look the same!

Click to expand...

Yes, changing the rockers changes nothing but the lift of the intake/exhaust.

 

donsbad68

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Jun 28, 2006

#13

• Jun 28, 2006

• #13

still say heads are much bigger then any other part of that combo

 

fiveoho

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#14

• Jun 28, 2006

• #14

thanks again aleborjas and 88Stang331

 

donsbad68

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#15

• Jun 28, 2006

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LOL no thanks to me. I'm too negative I guess

 

J

jjd975

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Jun 28, 2006

#16

• Jun 28, 2006

• #16

donsbad68 said:

LOL no thanks to me. I'm too negative I guess

Click to expand...

The other guys answered his questions, you and I talked about the heads not being right.