Normal PSI compression numbers

[DesertSasquatchXploration]

I recently ditched my 34pict for a single 40 IDF on my 1776 stocker 100 cam built by Brothers in Ontario in 2019 just rolled over 50k. Today I pulled along side another bug we were talking at the stop light he had a 1776 with 34 ICT's. At the light we went for it, I pulled ahead pretty easily and left him in the dust. I decided to do a compression test never done one on this motor or had the need to. 165 throttle open and 150 closed that seems really high. This was with the plugs in. Did it again cold same numbers. I'm was thinking about some heads from Steve Tim's and bump up the compression but... Now i'm thinking leave it alone. What are the stock compression numbers? Is my engine already at 8:1 to 8.5:1 so much for a (stocker)

[Dusty1]

"If it ain't broke don't fix it."

If you have Tims heads in your future, buy 'em. Murphy's Law of parts on the shelf states the parts they're intended to replace last longer if you CYA.

Do your compression test plugs out next time. 20,000 miles down the road do it again. Time to rebuild your engine is when one or more cylinders fall off. Install your Tims heads when you rebuild.

.
.

[jpaull]

165psi is awesome. You have way more then stock.
_________________
[email protected] MPH 1/4 Mile & 8.1 @ 83.7MPH in 1/8 Mile with Mild Type 1 VW Mag Case 2234cc commuter engine in stock weight bug w/only .491 total lift(CB2292 Cam), 42x37 heads, 48idf's, Street tires, Belt on, Mufflers, Pump gas, video of the run here: https://youtu.be/M3SPqMOKAOg

Transmission by MCMScott:
Rhino case, Klinkenberg 4.12, Superdiff, 002 mainshaft with 091 first idler. Weddle 1.48 Third & 1.14 Fourth.

[vwracerdave]

You always do a compression test with the engine hot, carbs wide open, and all plugs removed.

The numbers on your gauge really don't mean anything. Those cheap $30-$40 auto store gauges are not accurate or calibrated to anything. They could be 20-50 PSI off. All that matters is that all 4 cylinders have less than 10% difference.

I wouldn't bother getting new heads until you can also add dual IDF's, and a bigger cam, which means a complete tear down and rebuild.
_________________
2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK

[Alstrup]

[Zed999]

[nsracing]

If you got 150 lbs pressures on each cylinder, I suggest you go back to whoever built you the motor and buy them lunch for entire week!

..and tell them you want to adopt them.

That is a good build - I built many and people are happy when they see them numbers at pick up/ delivery.

Enjoy -

[DesertSasquatchXploration]

I guess it was 2020. I walked in with nothing but 3K in cash 4 days later it was done. As41 case never been lined bored (that's what they said) did a three angle valve job and beefed up the rocker arms with spacers and solid shafts along with the 100 cam. Just a long block I used my old shroud and bought the other stuff from car craft and pacific customs. I guess the case was going to be built for a turbo setup and the guy bailed. I was at the right place at the right time with cash. Got lucky

Would 1.25 rockers be worth it? Car Craft has good prices I can pick some up.

[nsracing]

w/ them 1.25 rockers just give me the money. At least one of us will be happy.

Save your money - they are worthless. One thing- get the solid rocker shafts i if you don't already have them.

Other than that, there is not much else left for improvement. You can ruin an masterpiece painting w// just one more brush stroke. So DON't!

[ORANGECRUSHer]

I'd say you did really good.
_________________
Brian H.
I may not know everything,but I will try to help if I can
OrangeCrushER Berrien Warrior 2.4L Quad4
LAZY MARY 1970 Baja 1835cc

[DesertSasquatchXploration]

Yes I have solid rocker shafts. Been changing oil every 1800K with VR1 and use a Ford FL1A or WIX oil filter. Ill leave it alone and keep doing what works maintenance wise. It's been a reliable solo desert exploration motor.

I've been tempted to use the Kendall Gt1, I did it once but felt like a Trader. I changed it early and felt like dirty sinner couldn't get my hands clean. I'm a Valvoline guy.

I had a 65 mustang in HS I used Castrol, Quaker state and some other cheap oil all lost like 15psi of oil pressure after one week. I used Valvoline it only went down 3psi after several weeks. I drove that car hard been a fan boy ever since.

[nsracing]

One thing that always was lacking in our aircooled motors, is a better breathing system.

A better case ventilation has always been lacking. The original motor breather was fine for the stock configuration. But who has stock motor anymore?

I have been meaning to TIG weld some breathers. One of these days I may have time to machine some nipples and weld up some units.

And the Stainless Steel sidewinder exhaust is another welcome addition. That is a nice exhaust lasting forever.

[DesertSasquatchXploration]

[oprn]

50psi off on a 200 or 300psi gauge is a lot. I think you would see that as it would be on the zero side of the scale. To be 50psi off on linearity would be highly unlikely even with the cheapest of gauges. It would have to over pressured badly, then the face taken off and reset back to zero. A bulged or kinked bourbon tube would be your clue if you took it apart.
_________________
We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age)

[rugblaster]