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Search took 0.01 seconds. Search: Posts Made By: mkpontiac
Forum: Pontiac - Street 05-03-2023, 11:34 PM
Replies: 36
Views: 3,404
Posted By mkpontiac
No problems with detonation then? Looking...

No problems with detonation then? Looking through many posts over the years it seems many of those who have success with those pistons are using the 068 cam. Is the engine in a car yet or was it...
Forum: Pontiac - Street 03-08-2023, 12:13 AM
Replies: 28
Views: 2,682
Posted By mkpontiac
The 067 and 2800 cam were mentioned in this...

The 067 and 2800 cam were mentioned in this thread. The Max Performance Pontiac book has the 067 at 113 LSA and 113 intake centerline. I would expect the wider LSA and later intake closing to be...
Forum: Pontiac - Street 10-29-2022, 08:49 PM
Replies: 57
Views: 4,752
Posted By mkpontiac
Tom What does it mean to pickle the engine with...

Tom
What does it mean to pickle the engine with diesel fuel?
Mark
Forum: Pontiac - Street 05-15-2022, 08:24 PM
Replies: 43
Views: 7,259
Posted By mkpontiac
In considering octane resistance for the 281/287...

In considering octane resistance for the 281/287 @0.006 with 230/236 @0.050 HR cam recommended vs an XE274 HFT are the greatest contributing factors the 112 vs 110 LSA and the 112 ICL vs the 106 ICL?...
Forum: Pontiac - Street 02-02-2021, 12:34 AM
Replies: 2
Views: 648
Posted By mkpontiac
Needle Seat Removal

I have a 69 Pontiac Quadrajet and am having difficulty removing the needle seat. I have the correct wide tip screw driver. It just won’t budge. Any tips?
Forum: Pontiac - Street 10-24-2020, 08:47 PM
Replies: 39
Views: 4,003
Posted By mkpontiac
I live in the Central Valley and at some point...

I live in the Central Valley and at some point will needs some work done. What is the name of the shop.
Forum: Pontiac - Race 10-14-2020, 09:55 PM
Replies: 43
Views: 4,057
Posted By mkpontiac
pastry_chef It all seems to make sense. I am...

pastry_chef
It all seems to make sense. I am just trying to make a comparison between cams at 0.004 tappet lift for calculating dynamic compression.
Thanks,
Forum: Pontiac - Race 10-13-2020, 12:08 AM
Replies: 43
Views: 4,057
Posted By mkpontiac
From Steve C quoting UD Harold that all of his...

From Steve C quoting UD Harold that all of his designs have a hydraulic Intensity of 53.88 degrees at 0.004 tappet lift would this mean that the Voodo advertised duration of the 702 cam for instance...
Forum: Pontiac - Street 05-13-2020, 12:03 AM
Replies: 24
Views: 4,127
Posted By mkpontiac
If I aiming for 89 octane, which gives me some...

If I aiming for 89 octane, which gives me some room if 91 is required, what compression ratio should I aim for with the 60918 and 60241 cams? Is 9.5:1 too high? Assume 0 deck and 400 ci.
Forum: Pontiac - Street 05-10-2020, 08:29 PM
Replies: 24
Views: 4,127
Posted By mkpontiac
That all makes sense, thank you. Without...

That all makes sense, thank you. Without consistent seat timing specifications it makes it difficult to determine seat to seat duration and correct dynamic compression which makes it difficult to...
Forum: Pontiac - Street 05-09-2020, 08:20 PM
Replies: 24
Views: 4,127
Posted By mkpontiac
Cam Overlap Effects On Vacuum & MPG

If two cams have the same 0.050 duration lift and LSA but very different duration at 0.006 lift(advertised) and therefore different overlap what are the affects on idle, vacuum, and mpg? I am...
Forum: Pontiac - Street 03-17-2017, 11:27 PM
Replies: 13
Views: 604
Posted By mkpontiac
The sending wire on my GP runs over the top of...

The sending wire on my GP runs over the top of the tank. I tighten the tank straps too tight and it caused the wire to ground out. When I loosened the tank straps a little the gauge work properly.
Forum: Pontiac - Street 12-20-2016, 01:11 AM
Replies: 5
Views: 334
Posted By mkpontiac
Thank you Cliff. The throttle shaft is bent...

Thank you Cliff.
The throttle shaft is bent enough that I cannot rotate it, which is what appears to have caused the crack. I will see if I can get it apart with out further damage.

If I have to...
Forum: Pontiac - Street 12-19-2016, 07:58 PM
Replies: 5
Views: 334
Posted By mkpontiac
Quadrajet Base Plates

I picked up a 7029268(1969 400 Auto) quadrajet core which is the correct carburetor for my 69 GP 400. The base plate has a crack on the outer part of the throttle shaft bore. I have a 7028262(1968...
Forum: Pontiac - Street 01-26-2015, 01:09 AM
Replies: 14
Views: 507
Posted By mkpontiac
Tom Is the 180psi with 91 octane on a Zero...

Tom
Is the 180psi with 91 octane on a Zero Decked engine or would that allow more psi?
Mark
Forum: Pontiac - Street 01-03-2015, 12:43 AM
Replies: 73
Views: 3,869
Posted By mkpontiac
Some of us have the 8 valve relief pistons...

Some of us have the 8 valve relief pistons because of inexperience or ignorance at the time. I blindly had my engine rebuilt 15+ years ago and ended up with those pistons. My car runs hot on...
Forum: Pontiac - Street 02-03-2013, 02:55 AM
Replies: 43
Views: 2,965
Posted By mkpontiac
Baron Von Zeppelin What compression did you run...

Baron Von Zeppelin
What compression did you run with the Rhoads lifters?
Forum: Pontiac - Street 01-28-2013, 10:48 PM
Replies: 43
Views: 2,965
Posted By mkpontiac
Something often overlooked is the lobe...

Something often overlooked is the lobe seperation. The 068 cam is on 116° lobe separation angle while the Summit is on 112° lobe seperation angle. If installed as recommended this puts the 068 cam...
Forum: Pontiac - Street 01-25-2013, 12:18 AM
Replies: 6
Views: 375
Posted By mkpontiac
From either contacting the company or finding the...

From either contacting the company or finding the information on their website I was able to confirm the following lift points for advertised duration on hydraulic flat tappet cams:

Comp Cams...
Forum: Pontiac - Street 01-04-2013, 12:39 AM
Replies: 6
Views: 375
Posted By mkpontiac
Thank you for the replies. That explains why I...

Thank you for the replies. That explains why I am having trouble finding the information for most of them.

I wanted to calculate some dynamic compression ratios and compare pontiac cams to common...
Forum: Pontiac - Street 01-02-2013, 11:53 PM
Replies: 6
Views: 375
Posted By mkpontiac
Advertised Duration Measured at ?

From what I can find advertised hydraulic flat tappet cam durations are measured at:
Comp 0.006"
Crower 0.006" ?
Crane 0.004"
Pontiac .004" or .006"?
Summit ?
Lunati ?

Are these correct? ...
Forum: Pontiac - Street 11-22-2012, 01:52 AM
Replies: 76
Views: 4,293
Posted By mkpontiac
Does reducing overlap improve mpg? If so will...

Does reducing overlap improve mpg? If so will adding Rhoads lifters on the exhaust side only help? Overlap on the recommend cams so far is all less then 0° except for under 0.050 lift. Does that...
Forum: Pontiac - Street 11-07-2012, 11:18 PM
Replies: 2
Views: 221
Posted By mkpontiac
When reinstalling my fuel tank I over tightened...

When reinstalling my fuel tank I over tightened the straps that hold the tank which sandwiched the wire that runs across the top. It ground out the sending wire affecting the gauge reading. I...
Forum: Pontiac - Street 01-26-2011, 01:08 AM
Replies: 1
Views: 125
Posted By mkpontiac
Pinging Theory Question

Assuming all is correct in an engine combo with no pinging present and then the compression ratio is increased such that pinging is present. In general will the pinging occur in a particular RPM...
Forum: Pontiac - Street 01-01-2011, 09:57 PM
Replies: 57
Views: 1,810
Posted By mkpontiac
I drilled two holes in a piece of angle iron that...

I drilled two holes in a piece of angle iron that aligned with holes on the dampener and bolted it up with the pulley bolts. The length of the angle iron was long enough that the other end contacted...
Showing results 1 to 25 of 41
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