• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

TR2/3/3A Surprise on compression.

tinman58

Jedi Knight
Silver
Country flag
Offline
I am going to have Jeff at advanced dist. build me a new dizzy. On his work sheet He asked for all the info on your engine. I know most of it in my head. But never did a compression check, Just did it this morning 190-190-193-190. I was surprised on the high numbers. On my TR 250 the reading are in the 145 range... The head must have been shaved a little more than stock. LOL.
 

TR4nut

Yoda
Country flag
Offline
Dan-

I'm not knowledgeable at all on superchargers, but don't you get a bump from that as well? 190 sounds pretty high as is.

Randy
 
OP
tinman58

tinman58

Jedi Knight
Silver
Country flag
Offline
That does make sense. I hope that somebody will respond with a better understanding.
 

CJD

Yoda
Country flag
Offline
I dug through the service manual, and indeed, 190 psi is high. The general section says 120 psi average. That's not a bad thing, though, unless you are having detonation issues...
 
OP
tinman58

tinman58

Jedi Knight
Silver
Country flag
Offline
I use premium gas. No detionition issues. Just wanted to get as much info to Jeff as possible. Now off for a quick drive to burn off some fuel so I can put more fuel in. OK it is just an excuse to go for a drive.
 

poolboy

Yoda
Country flag
Offline
:wink-new: It's a wonder the spark plugs haven't blown out their holes.
 

Jerry

Luke Skywalker
Gold
Country flag
Offline
I have a Healey head that is severly ported by someone that was racing. The compression was 245 psi, and it went very fast. But you needed about 100 octane to keep from pinging so I replaced with with a standard head. I want the power back but don't want to buy racing fuel! Boy what torque!

I bet the compression and the supercharger on the TR3 gets the results also.
Jerry
 

trrdster2000

Luke Skywalker
Country flag
Offline
We just did my friends TR4A and got 175 to 170, runs great, just takes forever to warm up and normal for this car is a little above center. Lets face it. could be the gauge or sending unit, maybe replace the thermostat with a 196 degrees and see if it runs better as it never (KNOCK ON WOOD) overheats.

Wayne
 

RJS

Jedi Warrior
Country flag
Offline
Hey

FWIW, my TR4A runs 180psi/ 175psi/ 180psi/ 175psi dry compression test and 208psi/ 200psi/ 208psi/ 200psi wet compression test. Took readings with both my brother's gauge and my best friend's. Reading b/t the two gauges were within 5psi of each other. Otherwise, car runs perfect. No pinging and instant throttle response. I do use the highest octane gas I can find.

The reason I was checking was because I suspected excessive blow by which was overwhelming the stock PCV valve. It is the "pancake" PCV valve which is a closed loop feeding gasses back into the intake manifold. I will say, I run the car without the PCV now and it does run/idle much better.

Bob
 
Similar threads
Thread starter Title Forum Replies Date
H TR4/4A Easter Surprise Triumph 3
DrEntropy MGB Breakfast surprise MG 4
Drone Dog bt7 head surprise Austin Healey 7
H TR6 OEM Connecting Rod surprise Triumph 4
Rut TR4/4A TR4a surprise Triumph 9
kennypinkerton MGB Rubber bumper weight surprise.. MG 4
vickxxx TR2/3/3A An unexpected surprise Triumph 9
tomshobby A nice surprise from Eastwood Company Restoration & Tools 2
5 Surprise Drive Spridgets 0
tinman58 General TR What a surprise!! Triumph 17
Jim_Gruber So who has found Basil's Holiday surprise? Spridgets 8
S TR6 TR6 Dash refinish: a nice surprise Triumph 4
doc50 TR2/3/3A TR3 Piston Surprise Triumph 18
B Surprise! Gues what I found in my glovebox! MG 2
B A pleasant surprise Triumph 3
J Got the hood open and surprise! Triumph 13
aeronca65t Racing Surprise Racing 4
RAC68 Vacuum Surprise and Then Some Austin Healey 9
E Dad's Surprise 60th birthday present Spridgets 11
bcliff A nice surprise MG 6
vping T-Series Pleasant surprise from my TD MG 1
germanmichel Positive surprise package... with pics Austin Healey 0
vping MY 525I Surprise! Other Cars 17
MadRiver MGB Surprise MGB Encounter MG 2
TR6oldtimer Surprise surprise, it's galvanized Triumph 7
S Surprise Win Austin Healey 7
D Surprise Find Triumph 4
SCguy Surprise/surprise Triumph 1
A Imagine my surprise ! Austin Healey 7
TR4nut One more day til my wife's birthday surprise Triumph 19
aeronca65t Driveway Surprise Austin Healey 4
vping First surprise of the day! MG 15
DART Car sightings surprise Other British Cars 5
1 Another Surprise on EBAY MG 11
G Surprise Jags! Jaguar 1
B TR4/4A Finding compression stroke Triumph 7
M TR6 High Compression in One Cylinder Triumph 28
AUSMHLY Compression test results Austin Healey 17
S TR2/3/3A Compression Triumph 8
J TR2/3/3A Figure of Eight Gasket Compression - Copper vs. Steel Triumph 8
NutmegCT Variable compression? Other Cars 22
T Even but low compression on 3.8 - timing slightly off? Jaguar 7
edkap2002 TR6 fuel line compression fittings....how to remove Triumph 3
R TR2/3/3A Good Compression Triumph 1
3798j Fastronix Battery Compression Ends Restoration & Tools 4
F TR2/3/3A Compression Test Triumph 13
K TR2/3/3A Compression testing again... Triumph 4
HighAltitudeTR3 TR2/3/3A Compression Question Triumph 10
warwick-steve High compression head identification Austin Healey 16
Tinkerman TR2/3/3A 1960 TR3A engine compression question. Triumph 7

Similar threads

Top