Forum - Topic


Heads , cylinders , power our machines


Forum Tech corner Heads , cylinders , power our machines




maxipes  
František
2016-09-02 11:10:52

Nowhere on the web I found anything coherent as Tika heads and cylinders in Jawách the content of 350cc. I will describe only třistapadesátky since they own. As every knows about bikes in Jawa during their manufacture from Perak to even the Jawa 638 type designation too big visible changes in the combustion chamber of the engine there, but that little had an effect on engine performance. Not only changes to the engine itself but also in carburetors and exhaust pipe and muffler samotmém. During the development of motorcycles Jawa tried to keep poměrhluku and pollutants according to standards not only changed the ratio of gasoline and oil gradually from 1:25 to 1:50 but the imposition of the connecting rod and piston pins. All these modifications have had an impact on engine performance. Some might argue that modifying overflow channels also changed a lot, but inaccuracies casting it was not so giddy. Changes to achieve when everyone who wanted their own initiative, took šmirgl, file or other abrasive and either using templates or from the eye of channels adapted and attuned so that he is without sharp edges and pretty as one another.

maxipes  
František
2016-09-02 11:12:58

To actually observing changes in the heads and cylinders. Rollers series Shuttlecock to Jawa nearly 360 are visually similar , at least in shape . But when we get bogged down somewhat in detail to find out the few differences here and I'll describe the pictures show the same will and the heads of cylinders .

maxipes  
František
2016-09-02 11:19:49

Rolls engines from Perak type 18 is distinguished by two main distinguishing features , and it is as if the top of the polyhedral whither head gasket , and another sign that the suction channel is divided into two parts . Head to the engine is low and rounded with a single horizontal rib in addition. Shape whither head gasket is the same as on the cylinder. The head is this big compression space measured from edge to edge of about 56 mm see photo. This engine had a compression ratio of 6.25 : 1 and power 8,8Kw

maxipes  
František
2016-09-02 11:20:44

Šlo se po zvyšování výkonu a tak jawa typ 354 měla upravené válce i hlavy. Válce pohledově stejné jako u tady popisovaného péráka měli patrné změny a to v sacím otvoru a části kam přišlo těsněni pod hlavu. Sací otvor byl jeden celek a část kam přišlo těsnění pod hlavu bylo skoro kulaté. První motory třistapadesátčtyřek měly hlavy měly nízké zaoblené hlavy podobně jako měla Jawa pérák typ 18 s rozdílem že měla jen jedno vodorovné žebro a zmenšen kompresní prostor 27,4ccm na 23.8 ccm.

maxipes  
František
2016-09-02 11:21:59

Numerical designation of the heads was 26-354-13-104 . Measuring from edge to edge , I came to the dimensions of approximately 43 mm.Tím created with the same engine capacity greater compression ratio and a 7.2 : 1 in the performance 11,5Kw . Over time, however, the performance kejvaček mounted and adjusted to the head and had been low and rounded as in Perak , but was was higher following the shape of cylinders with rounded ribs. Numerical designation 26-354-13-113 . Kopresní space shrunk a bit from 23,8ccm to 23,2ccm incurring a compression ratio of 7.4 : 1 power went up to 11,8Kw . I should change the cylinder and the suction hole was such a more oval . Probably only ease of manufacturing because the boss in the space above the result of the exhaust from the cylinder is also the previous type , but not everyone .

maxipes  
František
2016-09-02 11:23:31

Came a series Jaw labeled 360. These compared with previous třistapadesátčtyřkám reached the higher compression ratio and a 8.1 : 1st This reduced clearance volume to 21.2 cc . Dimensionally the same as the last head 354. The head has a marking 360 - xx - xx -xxx (I have it mounted in one engine thus when she 'll be taking down the numbers add it later) . Tou this change and others of little changes achieved performance engines 13,2Kw

maxipes  
František
2016-09-02 11:26:15

I'll describe the motors only known me and the type referred to as 633 bison . 63x series engine labeled the era of round engines. The truth that must Jawa 362-00 type had squared the war but kulatej engine based on the concept angularity 360. The engines were caused by the increasing požadavkama for more. It showed the necessary cooling and increase the cooling surfaces of the ribs placed on the rollers and the heads of engines . Šesttřitrojek war should fit the exhaust pipe as Čezeta one screw and suction channel same as the previous model being described 360th

maxipes  
František
2016-09-02 11:27:31

Rollers were already squared . Heads with similar ribs as the heads of the previous type 360 but with that replicate the shape of the square rollers and the slant from the front it was low and rising to the rear. Compression ratio was adjusted to 9.2 : 1 by reducing the dead space to 18.6 cc . The performance of this engine was 15,5Kw . Numeric designation of the head do not know as to those who got no not have enough size photo of the dead space from edge to edge I measured 38.5 mm .

maxipes  
František
2016-09-02 11:29:23

Jawa 634 type designation belonged had also boxy engines last in a series of what was in each cylinder , three bolts . Compression ratio remained the same as 633 and 9.2 : 1 only the power was different and 14.7 kW . What was it caused by ? Each engine had its best performance and torque jinejch speed. Rollers had the same shape as the 633 with the difference that the exhaust knee was caught in the inner nut rolls. The head is higher hranatej replicating the shape of the rolls in front of the larger ribs gradually decreasing in the rear. Ribbing heads is different than with previous models .

maxipes  
František
2016-09-02 11:32:14

So that now every thought to confuse the head and roller type for what had Jawa 634 , and will have hnedle about two kilowatts to exercise more. It's not that . With the gradual development of engines Jawa also improved the intake , exhaust and transfer ports in the cylinders and the block itself motoru.To itself to increase performance, not even need to have the appropriate exhaust and carburetor filter , and not only that , when produced VELOREX and drove on another kind of gasoline I guess it was about eighty octanoic normal. It also has an influence on the running of the engine . Today, driven mainly octanoic 95 Natural, who's burning faster and has greater extensibility gases. This implies that if we go back engine development as varied as the compression ratio and the quality of fuel on who's rode it all . Thus, in terms of timing and engine fuel that the engine goes . If I take a similar concept as the engine třistapadesátky VELOREX and Jawa 354th

maxipes  
František
2016-09-02 11:35:17

It had a compression ratio of 7.2 : 1 and about 3.5 mm advance before top dead center . Well, he poured into him eighty octanoic normal. In contrast Jawa 638 already had a compression ratio of 10.2 : 1 advance about 2.5 mm before TDC , and drawn into the special gasoline 90 octane . Despite the fact that the feed motor is also changed diameters of main nozzles in order to maintain a proper ratio of air fuel about 12.5 to about 15 : 1. regulate this main tryskama diameters from about 110 to 80 well level of the fuel in the carburetor . Certainly lounge is open for folks noticed that if there is gasoline in the carburetor idle speed increases and then it dies .

maxipes  
František
2016-09-02 11:38:06

Adjusting the level in the float chamber discover follows. Float chamber should supposed to be such that when gasoline into the carburetor begins without flooded ! and after a steady fuel supply shuts down

Subdivide gently float cap are two screws . Then squeeze the floats gently to the bottom for a needle and levels should supposed to be at the same time of the float when the float will be more tough or if you do not seal the needle is lehkej min . The reasons why this is so everyone can read clever books in here or on wabu in articles I wrote .

maxipes  
František
2016-09-02 11:44:21

To compare changes in compression ratio to hones , I organized some sort table . Jeliož have long disputed whether the závratnej effect on engine performance disparity explosions in the engine. Just the fact alone neseřiditelnosti hammers twin engine to burn both the same sort of effect it really has . Many people are convinced itself if you planted a motor that has some contactless quieter engine operation and other consumption. I also zabejval that why dvouválcovejch Jawách goes before bearing right rod . Surely he noticed that when you let kažej Reuse kliku.Na I prepared a poll.

maxipes  
František
2016-09-02 11:45:51

This is due to the intake of air and dirt around the oil seals on the side dynamo . Whether I like it or not sucking on the left side of the gearbox and the right side air from the dynamo. In the engine during the intake and overflow mixture into the crank chamber and the consequent inflammation and explosion in the combustion chamber leads to unwanted release of pressure in the space leaks crank piston rings. This pressure were causing ejection slip on the part of the dynamo engines and transmissions first Jawa had in fact between the bearings and oil seals for segrovku.Tu motors have veloušů up for Gufera .

maxipes  
František
2016-09-02 11:47:52

But the slip vibration, changing the pressure in the crank space there anyway. Slowly , one could say that it is like a membrane . Smaller gugero and O-ring must be some kind of alloy in which it was lip wagered it could solve . However, the layoffs and subsequent air being sucked to prevent power not through oil seals . Ono gives lip therefore should always give the inside against the pressure in the space but handles changes to pressurize the intake speed of the engine " Now babo rad".

maxipes  
František
2016-09-02 11:49:13

The ratio of mixing oil with gasoline 33 : 1 , the manufacturer just neplácl the eye said it was watching and with different zkouškama . At a saying what anyone kulpuju oil M2T brand Benzina and Paramo whose price ranges from 58kč to CZK 100 per liter. I keep the ratio předepsanej engine manufacturer. Although it takes more smoke but it goes and that's fine .

maxipes  
František
2016-09-02 11:50:21

Why do I mention goes oto when a person goes in a column at rallies someone smokes měkomu it 's not spitting oil from the exhaust, and then you sail from drops of oil on the hood of the window and in the worst cases, the face and without UV factor  . Why is that some oils are harder to burn and just go out the tailpipe in the form of oil and not smoke around it's more organic.

maxipes  
František
2016-09-02 11:52:21

I drew information from various sources and I noticed the frequent differences in compression ratios and performance of reading in the same machine because the information described here consider it just as a preview to my observation of changes in engine development Jawa . I attach a few photos of different types and designs of heads and cylinders.

maxipes  
František
2016-09-02 11:56:03

Table when the head 354 with the compression space 23.2

61 twelfth cut 189,960 8,187 content compression ratio

60 eighth cut 183,783 content compression ratio of 7.92

59.75 seventh cut 182,254 content compression ratio of 7.85

59,5 sixth cut 180,732 content compression ratio of 7.79

59.25 fifth cut 179,217 content compression ratio of 7.72

59 fourth cut 177,708 content compression ratio of 7.65

58.75 176,205 third selecting content compression ratio 7.595

58.5 second cut of 174,708 content compression ratio of 7.53

58.25 first cut of 173,218 content compression ratio of 7.46

58 original contents cut 171,735 7.40 compression ratio.

maxipes  
František
2016-09-02 12:00:10

I hope it was beneficial this small observation .


Reply